diff --git a/app/models/event.rb b/app/models/event.rb
index ecf9973..2d86869 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -29,6 +29,10 @@ class Event < ActiveRecord::Base
     proposer.personal_profile(conference)
   end
 
+  def length
+    read_attribute(:length) || event_type.try(:minimum_length)
+  end
+
   private
 
   def track_belongs_to_the_selected_conference
diff --git a/db/migrate/20150819213202_drop_default_value_for_length_in_events.rb b/db/migrate/20150819213202_drop_default_value_for_length_in_events.rb
new file mode 100644
index 0000000..df70401
--- /dev/null
+++ b/db/migrate/20150819213202_drop_default_value_for_length_in_events.rb
@@ -0,0 +1,5 @@
+class DropDefaultValueForLengthInEvents < ActiveRecord::Migration
+  def change
+    change_column_default(:events, :length, nil)
+  end
+end