diff --git a/app/models/build_list.rb b/app/models/build_list.rb
index cbbe7365a..78fd26df5 100644
--- a/app/models/build_list.rb
+++ b/app/models/build_list.rb
@@ -139,6 +139,14 @@ class BuildList < ActiveRecord::Base
     {:project => project.name, :version => project_version, :arch => arch.name}.inspect
   end
 
+  def human_duration
+    I18n.t("layout.build_lists.human_duration", {:minutes => (duration/60).to_i, :seconds => (duration%60).to_i})
+  end
+
+  def finished?
+    [BuildServer::BUILD_ERROR, BuildServer::SUCCESS].include? status
+  end
+
   private
     def set_default_status
       self.status = WAITING_FOR_RESPONSE unless self.status.present?
diff --git a/app/models/build_list_observer.rb b/app/models/build_list_observer.rb
new file mode 100644
index 000000000..793ff8e48
--- /dev/null
+++ b/app/models/build_list_observer.rb
@@ -0,0 +1,13 @@
+class BuildListObserver < ActiveRecord::Observer
+  observe :build_list
+
+  def before_update(record)
+    if record.status_changed?
+      record.started_at = Time.now if record.status == BuildServer::BUILD_STARTED
+      if [BuildServer::BUILD_ERROR, BuildServer::SUCCESS].include? record.status
+        # stores time interval beetwin build start and finish in seconds
+        record.duration = (Time.now - record.started_at).to_i
+      end
+    end
+  end
+end
diff --git a/app/views/build_lists/show.html.haml b/app/views/build_lists/show.html.haml
index e0ce5b3bb..32fca1d6a 100644
--- a/app/views/build_lists/show.html.haml
+++ b/app/views/build_lists/show.html.haml
@@ -52,6 +52,11 @@
 .leftside.width125= t("activerecord.attributes.build_list.is_circle")
 .leftside= t("layout.#{@build_list.is_circle?}_")
 .both
+- if @build_list.finished?
+  %br
+  .leftside.width125
+  .leftside= @build_list.human_duration
+  .both
 .hr
 %h3= t("layout.build_lists.items_header")
 - if @item_groups.blank?
diff --git a/config/application.rb b/config/application.rb
index 6a3448bfc..0ec322cea 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -31,7 +31,7 @@ module Rosa
     # config.plugins = [ :exception_notification, :ssl_requirement, :all ]
 
     # Activate observers that should always be running.
-    config.active_record.observers = :event_log_observer, :activity_feed_observer
+    config.active_record.observers = :event_log_observer, :activity_feed_observer, :build_list_observer
 
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
diff --git a/config/locales/models/build_list.en.yml b/config/locales/models/build_list.en.yml
index 65e756a92..bf5d6a398 100644
--- a/config/locales/models/build_list.en.yml
+++ b/config/locales/models/build_list.en.yml
@@ -29,6 +29,8 @@ en:
         project_version: Version
         user: User
         preferences: Preferences
+        started_at: Build started at
+        duration: Build duration in seconds
 
       build_list/item:
         name: Name
@@ -59,6 +61,7 @@ en:
       action: Action
       new_header: New build
       main_data: Main data
+      human_duration: Build lasted %{minutes} minutes %{seconds} seconds
 
       ownership:
         header: Build list ownership
diff --git a/config/locales/models/build_list.ru.yml b/config/locales/models/build_list.ru.yml
index 7723f2d9f..de287fb1c 100644
--- a/config/locales/models/build_list.ru.yml
+++ b/config/locales/models/build_list.ru.yml
@@ -29,6 +29,7 @@ ru:
         project_version: Версия
         user: Пользователь
         preferences: Настройки
+        duration: Длительность билда в секундах
 
       build_list/item:
         name: Название
@@ -59,6 +60,7 @@ ru:
       action: Действие
       new_header: Новая сборка
       main_data: Основные данные
+      human_duration: Сборка продлилась %{minutes} минут %{seconds} секунд
 
       ownership:
         header: Принадлежность заданий
diff --git a/db/migrate/20120331180541_customize_platform.rb b/db/migrate/20120331180541_customize_platform.rb
index 8a02ffd2d..6b5aa53ed 100644
--- a/db/migrate/20120331180541_customize_platform.rb
+++ b/db/migrate/20120331180541_customize_platform.rb
@@ -2,7 +2,7 @@
 class CustomizePlatform < ActiveRecord::Migration
   def self.up
     change_column_null :platforms, :name, false
-    change_column_null :platforms, :distrib_type, false
+    #change_column_null :platforms, :distrib_type, false
     change_column_null :platforms, :platform_type, false
     change_column_null :platforms, :released, false
     change_column_null :platforms, :visibility, false
diff --git a/db/migrate/20120411122636_add_started_at_and_finished_at_to_build_lists.rb b/db/migrate/20120411122636_add_started_at_and_finished_at_to_build_lists.rb
new file mode 100644
index 000000000..52dc251fa
--- /dev/null
+++ b/db/migrate/20120411122636_add_started_at_and_finished_at_to_build_lists.rb
@@ -0,0 +1,6 @@
+class AddStartedAtAndFinishedAtToBuildLists < ActiveRecord::Migration
+  def change
+    add_column :build_lists, :started_at, :datetime
+    add_column :build_lists, :finished_at, :datetime
+  end
+end
diff --git a/db/migrate/20120411142146_remove_unused_fields.rb b/db/migrate/20120411142146_remove_unused_fields.rb
new file mode 100644
index 000000000..dbb3b6d83
--- /dev/null
+++ b/db/migrate/20120411142146_remove_unused_fields.rb
@@ -0,0 +1,9 @@
+class RemoveUnusedFields < ActiveRecord::Migration
+  def up
+    remove_column :build_lists, :started_at
+    remove_column :build_lists, :finished_at
+  end
+
+  def down
+  end
+end
diff --git a/db/migrate/20120411142354_add_started_at_and_duration_to_build_lists.rb b/db/migrate/20120411142354_add_started_at_and_duration_to_build_lists.rb
new file mode 100644
index 000000000..93b527eda
--- /dev/null
+++ b/db/migrate/20120411142354_add_started_at_and_duration_to_build_lists.rb
@@ -0,0 +1,6 @@
+class AddStartedAtAndDurationToBuildLists < ActiveRecord::Migration
+  def change
+    add_column :build_lists, :started_at, :datetime
+    add_column :build_lists, :duration, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b15f77dec..2d9c8b6da 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,14 +11,14 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20120404134602) do
+ActiveRecord::Schema.define(:version => 20120411142354) do
 
   create_table "activity_feeds", :force => true do |t|
     t.integer  "user_id",    :null => false
     t.string   "kind"
     t.text     "data"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
   create_table "arches", :force => true do |t|
@@ -75,6 +75,8 @@ ActiveRecord::Schema.define(:version => 20120404134602) do
     t.string   "package_version"
     t.string   "commit_hash"
     t.integer  "priority",         :default => 0,     :null => false
+    t.datetime "started_at"
+    t.integer  "duration"
   end
 
   add_index "build_lists", ["arch_id"], :name => "index_build_lists_on_arch_id"
@@ -188,7 +190,7 @@ ActiveRecord::Schema.define(:version => 20120404134602) do
     t.string   "owner_type"
     t.string   "visibility",         :default => "open", :null => false
     t.string   "platform_type",      :default => "main", :null => false
-    t.string   "distrib_type",                           :null => false
+    t.string   "distrib_type"
   end
 
   add_index "platforms", ["name"], :name => "index_platforms_on_name", :unique => true, :case_sensitive => false
@@ -259,25 +261,23 @@ ActiveRecord::Schema.define(:version => 20120404134602) do
     t.text     "description"
     t.string   "ancestry"
     t.boolean  "has_issues",        :default => true
+    t.boolean  "has_wiki",          :default => false
     t.string   "srpm_file_name"
     t.string   "srpm_content_type"
     t.integer  "srpm_file_size"
     t.datetime "srpm_updated_at"
-    t.boolean  "has_wiki",          :default => false
     t.string   "default_branch",    :default => "master"
     t.boolean  "is_rpm",            :default => true
   end
 
-  add_index "projects", ["owner_id"], :name => "index_projects_on_name_and_owner_id_and_owner_type", :unique => true, :case_sensitive => false
-
   create_table "register_requests", :force => true do |t|
     t.string   "name"
     t.string   "email"
     t.string   "token"
     t.boolean  "approved",   :default => false
     t.boolean  "rejected",   :default => false
-    t.datetime "created_at"
-    t.datetime "updated_at"
+    t.datetime "created_at",                    :null => false
+    t.datetime "updated_at",                    :null => false
     t.string   "interest"
     t.text     "more"
   end
@@ -331,16 +331,19 @@ ActiveRecord::Schema.define(:version => 20120404134602) do
     t.string   "name"
     t.string   "email",                                  :default => "",   :null => false
     t.string   "encrypted_password",      :limit => 128, :default => "",   :null => false
+    t.string   "password_salt",                          :default => "",   :null => false
     t.string   "reset_password_token"
     t.datetime "remember_created_at"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.text     "ssh_key"
     t.string   "uname"
     t.string   "role"
     t.string   "language",                               :default => "en"
-    t.datetime "reset_password_sent_at"
+    t.string   "confirmation_token"
+    t.datetime "confirmed_at"
+    t.datetime "confirmation_sent_at"
     t.integer  "own_projects_count",                     :default => 0,    :null => false
+    t.datetime "reset_password_sent_at"
     t.text     "professional_experience"
     t.string   "site"
     t.string   "company"
@@ -352,9 +355,6 @@ ActiveRecord::Schema.define(:version => 20120404134602) do
     t.integer  "failed_attempts",                        :default => 0
     t.string   "unlock_token"
     t.datetime "locked_at"
-    t.string   "confirmation_token"
-    t.datetime "confirmed_at"
-    t.datetime "confirmation_sent_at"
   end
 
   add_index "users", ["confirmation_token"], :name => "index_users_on_confirmation_token", :unique => true
diff --git a/spec/models/build_list_observer_spec.rb b/spec/models/build_list_observer_spec.rb
new file mode 100644
index 000000000..78ea54d44
--- /dev/null
+++ b/spec/models/build_list_observer_spec.rb
@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe BuildListObserver do
+  pending "add some examples to (or delete) #{__FILE__}"
+end