diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 94678315..d5937215 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -147,8 +147,7 @@ class ExercisesController < ApplicationController
   private :user_by_code_harbor_token
 
   def exercise_params
-    params[:exercise][:expected_worktime_seconds] = params[:exercise][:expected_worktime_minutes].to_i * 60
-    params[:exercise].permit(:description, :execution_environment_id, :file_id, :instructions, :public, :hide_file_tree, :allow_file_creation, :allow_auto_completion, :title, :expected_difficulty, :expected_worktime_seconds, files_attributes: file_attributes, :tag_ids => []).merge(user_id: current_user.id, user_type: current_user.class.name)
+    params[:exercise].permit(:description, :execution_environment_id, :file_id, :instructions, :public, :hide_file_tree, :allow_file_creation, :allow_auto_completion, :title, :expected_difficulty, files_attributes: file_attributes, :tag_ids => []).merge(user_id: current_user.id, user_type: current_user.class.name)
   end
   private :exercise_params
 
diff --git a/app/views/exercises/_form.html.slim b/app/views/exercises/_form.html.slim
index bb4aa851..646c359a 100644
--- a/app/views/exercises/_form.html.slim
+++ b/app/views/exercises/_form.html.slim
@@ -35,9 +35,6 @@
   .form-group
     = f.label(t('activerecord.attributes.exercise.difficulty'))
     = f.number_field :expected_difficulty, in: 1..10, step: 1
-  .form-group
-    = f.label(t('activerecord.attributes.exercise.worktime'))
-    = f.number_field "expected_worktime_minutes", value: @exercise.expected_worktime_seconds / 60, in: 1..1000, step: 1
 
   h2 = t('exercises.form.tags')
   ul.list-unstyled.panel-group
diff --git a/app/views/exercises/index.html.slim b/app/views/exercises/index.html.slim
index 18c2cd98..47198fbb 100644
--- a/app/views/exercises/index.html.slim
+++ b/app/views/exercises/index.html.slim
@@ -18,7 +18,6 @@ h1 = Exercise.model_name.human(count: 2)
         th = t('activerecord.attributes.exercise.maximum_score')
         th = t('activerecord.attributes.exercise.tags')
         th = t('activerecord.attributes.exercise.difficulty')
-        th = t('activerecord.attributes.exercise.worktime')
         th
           = t('activerecord.attributes.exercise.public')
           - if policy(Exercise).batch_update?
@@ -34,7 +33,6 @@ h1 = Exercise.model_name.human(count: 2)
           td = exercise.maximum_score
           td = exercise.exercise_tags.count
           td = exercise.expected_difficulty
-          td = (exercise.expected_worktime_seconds / 60).ceil
           td.public data-value=exercise.public? = symbol_for(exercise.public?)
           td = link_to(t('shared.edit'), edit_exercise_path(exercise)) if policy(exercise).edit?
           td = link_to(t('.implement'), implement_exercise_path(exercise)) if policy(exercise).implement?
diff --git a/app/views/exercises/show.html.slim b/app/views/exercises/show.html.slim
index 1efbd612..e3dfc7d5 100644
--- a/app/views/exercises/show.html.slim
+++ b/app/views/exercises/show.html.slim
@@ -20,7 +20,6 @@ h1
 = row(label: 'exercise.embedding_parameters') do
   = content_tag(:input, nil, class: 'form-control', readonly: true, value: embedding_parameters(@exercise))
 = row(label: 'exercise.difficulty', value: @exercise.expected_difficulty)
-= row(label: 'exercise.worktime', value: "#{@exercise.expected_worktime_seconds/60} min")
 = row(label: 'exercise.tags', value: @exercise.exercise_tags.map{|et| "#{et.tag.name} (#{et.factor})"}.sort.join(", "))
 
 h2 = t('activerecord.attributes.exercise.files')
diff --git a/config/locales/de.yml b/config/locales/de.yml
index 41d1097b..e4322037 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -41,7 +41,6 @@ de:
         allow_auto_completion: "Autovervollständigung aktivieren"
         allow_file_creation: "Dateierstellung erlauben"
         difficulty: Schwierigkeitsgrad
-        worktime: "vermutete Arbeitszeit in Minuten"
         token: "Aufgaben-Token"
       proxy_exercise:
         title: Title
diff --git a/config/locales/en.yml b/config/locales/en.yml
index ec6cf155..242ea312 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -41,7 +41,6 @@ en:
         allow_auto_completion: "Allow auto completion"
         allow_file_creation: "Allow file creation"
         difficulty: Difficulty
-        worktime: "Expected worktime in minutes"
         token: "Exercise Token"
       proxy_exercise:
         title: Title
diff --git a/db/migrate/20171002131135_remove_expected_working_time.rb b/db/migrate/20171002131135_remove_expected_working_time.rb
new file mode 100644
index 00000000..eb4bbcb4
--- /dev/null
+++ b/db/migrate/20171002131135_remove_expected_working_time.rb
@@ -0,0 +1,5 @@
+class RemoveExpectedWorkingTime < ActiveRecord::Migration
+  def change
+    remove_column :exercises, :expected_worktime_seconds
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 465ca604..818030b1 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170920145852) do
+ActiveRecord::Schema.define(version: 20171002131135) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -133,9 +133,8 @@ ActiveRecord::Schema.define(version: 20170920145852) do
     t.string   "token",                     limit: 255
     t.boolean  "hide_file_tree"
     t.boolean  "allow_file_creation"
-    t.boolean  "allow_auto_completion",                 default: false
-    t.integer  "expected_worktime_seconds",             default: 60
-    t.integer  "expected_difficulty",                   default: 1
+    t.boolean  "allow_auto_completion",                default: false
+    t.integer  "expected_difficulty",                  default: 1
   end
 
   create_table "exercises_proxy_exercises", id: false, force: :cascade do |t|