diff --git a/app/helpers/settings_helper.rb b/app/helpers/settings_helper.rb
index 86cdff9e4..68810aa9a 100644
--- a/app/helpers/settings_helper.rb
+++ b/app/helpers/settings_helper.rb
@@ -131,6 +131,9 @@ module SettingsHelper
 
   def session_lifetime_options
     options = [[l(:label_disabled), 0]]
+    options += [15, 30, 45].map {|minutes|
+      [l('datetime.distance_in_words.x_minutes', :count => minutes), minutes.to_s]
+    }
     options += [4, 8, 12].map {|hours|
       [l('datetime.distance_in_words.x_hours', :count => hours), (hours * 60).to_s]
     }