diff --git a/main/exercice/exercise.lib.php b/main/exercice/exercise.lib.php
index 2e92527303..d13b21b7be 100644
--- a/main/exercice/exercise.lib.php
+++ b/main/exercice/exercise.lib.php
@@ -1067,7 +1067,9 @@ function get_exam_results_data($from, $number_of_items, $column, $direction, $ex
                         $group_name_list .= $group_list_info[$id]['name'].' ';
                     }
                     $results[$i]['group_name'] = $group_name_list;
-                }
+                }                
+                
+                $results[$i]['exe_duration'] =  !empty($results[$i]['exe_duration']) ? round($results[$i]['exe_duration'] / 60) : 0;
 
                 $user_list_id[] = $results[$i]['exe_user_id'];
                 $id = $results[$i]['exe_id'];
diff --git a/main/exercice/exercise_report.php b/main/exercice/exercise_report.php
index 2a8ed7f5ac..4cbd1ffb42 100644
--- a/main/exercice/exercise_report.php
+++ b/main/exercice/exercise_report.php
@@ -331,7 +331,7 @@ if ($is_allowedToEdit || $is_tutor) {
 
 	//The order is important you need to check the the $column variable in the model.ajax.php file
 	$columns        = array(get_lang('FirstName'), get_lang('LastName'), get_lang('LoginName'),
-                        get_lang('Group'), get_lang('Duration'), get_lang('StartDate'),  get_lang('EndDate'), get_lang('Score'), get_lang('Status'), get_lang('Actions'));
+                        get_lang('Group'), get_lang('Duration').' ('.get_lang('MinMinute').')', get_lang('StartDate'),  get_lang('EndDate'), get_lang('Score'), get_lang('Status'), get_lang('Actions'));
 
 //Column config
 	$column_model   = array(
diff --git a/main/exercice/exercise_submit.php b/main/exercice/exercise_submit.php
index 2afeb20b32..803b70f57d 100644
--- a/main/exercice/exercise_submit.php
+++ b/main/exercice/exercise_submit.php
@@ -151,10 +151,9 @@ if ($objExercise->expired_time != 0 && $origin != 'learnpath') {
 	$time_control = true;
 }
 
-
 //Generating the time control key for the user
 $current_expired_time_key = generate_time_control_key($objExercise->id);
-$_SESSION['duration_time'][$current_expired_time_key] 	 = $current_timestamp;
+$_SESSION['duration_time'][$current_expired_time_key] = $current_timestamp;
 
 if ($time_control) {
 	//Get the expired time of the current exercice in track_e_exercices
diff --git a/main/inc/ajax/exercise.ajax.php b/main/inc/ajax/exercise.ajax.php
index b4c0ab91b6..269340b779 100644
--- a/main/inc/ajax/exercise.ajax.php
+++ b/main/inc/ajax/exercise.ajax.php
@@ -316,24 +316,25 @@ switch ($action) {
                 $duration = 0;
                 $now = time();
                 
+                if ($type == 'all') {
+                    $exercise_stat_info = $objExercise->get_stat_track_exercise_info_by_exe_id($exe_id);                        
+                }
+                
                 if (isset($_SESSION['duration_time'][$key]) && !empty($_SESSION['duration_time'][$key])) {
                     $duration = $now - $_SESSION['duration_time'][$key];
+                    
                     if (!empty($exercise_stat_info['exe_duration'])) {                        
-                        $duration += $exercise_stat_info['exe_duration']*60;
+                        $duration += $exercise_stat_info['exe_duration'];
                     }
-                    $duration = intval(round($duration/60));                     
-                    $_SESSION['duration_time'][$key] = 0;
-                } else {
+                    $duration = intval($duration);                    
+                } else {                    
                     if (!empty($exercise_stat_info['exe_duration'])) {
                         $duration = $exercise_stat_info['exe_duration'];
-                    }
-                    
-                    if ($type == 'all') {
-                        $exercise_stat_info = $objExercise->get_stat_track_exercise_info_by_exe_id($exe_id);
-                        $duration = $exercise_stat_info['exe_duration'];
-                    }
+                    }                 
                 }
-                                
+                
+                $_SESSION['duration_time'][$key] = time();
+                
                 update_event_exercice($exe_id, $objExercise->selectId(), $total_score, $total_weight, api_get_session_id(), $exercise_stat_info['orig_lp_id'], $exercise_stat_info['orig_lp_item_id'], $exercise_stat_info['orig_lp_item_view_id'], $duration, $question_list, 'incomplete', $remind_list);
                 
                  // Destruction of the Question object
diff --git a/main/inc/lib/events.lib.inc.php b/main/inc/lib/events.lib.inc.php
index 932b498fb1..1b4829ac5c 100644
--- a/main/inc/lib/events.lib.inc.php
+++ b/main/inc/lib/events.lib.inc.php
@@ -311,7 +311,7 @@ function event_link($link_id) {
  * @param   int     exo_id 	exercise id
  * @param   mixed   result 	score
  * @param   int     weighting ( higher score )
- * @param   int     duration ( duration of the attempt, in seconds )
+ * @param   int     duration ( duration of the attempt in seconds )
  * @param   int     session_id
  * @param   int     learnpath_id (id of the learnpath)
  * @param   int     learnpath_item_id (id of the learnpath_item)
@@ -322,7 +322,7 @@ function event_link($link_id) {
 */
 function update_event_exercice($exeid, $exo_id, $score, $weighting, $session_id, $learnpath_id = 0, $learnpath_item_id = 0, $learnpath_item_view_id = 0, $duration = 0, $question_list = array(), $status = '', $remind_list = array() , $end_date = null) {    
     //error_log('Called to update_event_exercice');
-    //error_log('duration:' . $duration);    
+    error_log('duration:' . $duration);    
 	require_once api_get_path(SYS_CODE_PATH).'exercice/exercise.lib.php';
     if ($exeid != '') {
 		// Validation in case of fraud with actived control time