diff --git a/modules/storm/stormtimetracking/stormtimetracking.theme.inc b/modules/storm/stormtimetracking/stormtimetracking.theme.inc
index ca4719b..8aed74f 100644
--- a/modules/storm/stormtimetracking/stormtimetracking.theme.inc
+++ b/modules/storm/stormtimetracking/stormtimetracking.theme.inc
@@ -174,7 +174,7 @@ function theme_stormtimetracking_list_report($report, $language, $timetrackings)
           check_plain($timetracking->project_title),
           check_plain($timetracking->title),
           format_date($timetracking->trackingdate, 'small'),
-          array('data' => sprintf('%.2f', $timetracking->billing_duration), 'align' => 'right'),
+          array('data' => stormtimetracking_duration($timetracking->billing_duration), 'align' => 'right'),
         );
         $total_billing_duration += $timetracking->billing_duration;
       }
@@ -193,7 +193,7 @@ function theme_stormtimetracking_list_report($report, $language, $timetrackings)
           check_plain($timetracking->project_title),
           check_plain($timetracking->title),
           format_date($timetracking->trackingdate, 'small'),
-          array('data' => sprintf('%.2f', $timetracking->billing_duration), 'align' => 'right'),
+          array('data' => stormtimetracking_duration($timetracking->billing_duration), 'align' => 'right'),
         );
         $total_billing_duration += $timetracking->billing_duration;
       }
@@ -215,7 +215,7 @@ function theme_stormtimetracking_list_report($report, $language, $timetrackings)
           check_plain($timetracking->task_title),
           check_plain($timetracking->title),
           format_date($timetracking->trackingdate, 'small'),
-          array('data' => sprintf('%.2f', $timetracking->billing_duration), 'align' => 'right'),
+          array('data' => stormtimetracking_duration($timetracking->billing_duration), 'align' => 'right'),
         );
         $total_billing_duration += $timetracking->billing_duration;
       }
@@ -237,7 +237,7 @@ function theme_stormtimetracking_list_report($report, $language, $timetrackings)
           check_plain($timetracking->task_title),
           check_plain($timetracking->title),
           format_date($timetracking->trackingdate, 'small'),
-          array('data' => sprintf('%.2f', $timetracking->billing_duration), 'align' => 'right'),
+          array('data' => stormtimetracking_duration($timetracking->billing_duration), 'align' => 'right'),
         );
         $total_billing_duration += $timetracking->billing_duration;
       }
@@ -246,6 +246,6 @@ function theme_stormtimetracking_list_report($report, $language, $timetrackings)
       $title .= t('Project : @project', array('@project' => $project->title), $language) .'<br />';
     break;
   }
-  $footer = '<h3>'. t('Total billing duration : %total_billing_duration', array('%total_billing_duration' => format_plural($total_billing_duration, '1 hour', '@count hours', array(), $language)), $language) .'</h3>';
+  $footer = '<h3>'. t('Total billing duration : %total_billing_duration', array('%total_billing_duration' => stormtimetracking_duration($total_billing_duration)), $language) .'</h3>';
   return theme('storm_list_report', $header, $rows, $title, $footer);
 }