Index: app/models/issue_query.rb
===================================================================
--- app/models/issue_query.rb	(revision 12027)
+++ app/models/issue_query.rb	(working copy)
@@ -263,6 +263,17 @@
         :default_order => 'desc',
         :caption => :label_spent_time
       )
+
+      @available_columns.insert index+1, QueryColumn.new(:total_spent_hours,
+        :sortable => "COALESCE( " +
+                     "(SELECT SUM(t.hours) FROM #{TimeEntry.table_name} AS t JOIN #{Issue.table_name} AS i ON t.issue_id = i.id " +
+                         "WHERE            (i.root_id = #{Issue.table_name}.root_id) " +
+                                      "AND (i.lft >= #{Issue.table_name}.lft) " +
+                                      "AND (i.rgt <= #{Issue.table_name}.rgt) " +
+                      "), 0) ",
+        :default_order => 'desc',
+        :caption => :label_total_spent_time
+      )
     end
 
     if User.current.allowed_to?(:set_issues_private, nil, :global => true) ||
Index: config/locales/de.yml
===================================================================
--- config/locales/de.yml	(revision 12027)
+++ config/locales/de.yml	(working copy)
@@ -726,6 +726,7 @@
   label_sort_lower: Eins tiefer
   label_sort_lowest: Ans Ende
   label_spent_time: Aufgewendete Zeit
+  label_total_spent_time: Kumulierte aufgewendete Zeit (mit Unteraufgaben)
   label_start_to_end: Anfang - Ende
   label_start_to_start: Anfang - Anfang
   label_statistics: Statistiken
Index: config/locales/en.yml
===================================================================
--- config/locales/en.yml	(revision 12027)
+++ config/locales/en.yml	(working copy)
@@ -732,6 +732,7 @@
   label_changes_details: Details of all changes
   label_issue_tracking: Issue tracking
   label_spent_time: Spent time
+  label_total_spent_time: Cumulated spent time (with subissues)
   label_overall_spent_time: Overall spent time
   label_f_hour: "%{value} hour"
   label_f_hour_plural: "%{value} hours"