diff --git a/completion/criteria/completion_criteria_duration.php b/completion/criteria/completion_criteria_duration.php
index aa34c6035de..17e6c2705eb 100644
--- a/completion/criteria/completion_criteria_duration.php
+++ b/completion/criteria/completion_criteria_duration.php
@@ -165,7 +165,7 @@ class completion_criteria_duration extends completion_criteria {
      * @return string
      */
     public function get_title_detailed() {
-        return ceil($this->enrolperiod / (60 * 60 * 24)) . ' days';
+        return get_string('xdays', 'completion', ceil($this->enrolperiod / (60 * 60 * 24)));
     }
 
     /**
@@ -190,7 +190,8 @@ class completion_criteria_duration extends completion_criteria {
 
         $daysleft = ceil($timeleft / (60 * 60 * 24));
 
-        return ($daysleft > 0 ? $daysleft : 0).' of '.$enrolperiod;
+        return get_string('daysoftotal', 'completion', array(
+                'days' => $daysleft > 0 ? $daysleft : 0, 'total' => $enrolperiod));
     }
 
     /**
diff --git a/lang/en/completion.php b/lang/en/completion.php
index fc9bc9e66d8..0f551c5b114 100644
--- a/lang/en/completion.php
+++ b/lang/en/completion.php
@@ -111,6 +111,7 @@ $string['criteriarequiredany'] = 'Any criteria below are required';
 $string['csvdownload'] = 'Download in spreadsheet format (UTF-8 .csv)';
 $string['datepassed'] = 'Date passed';
 $string['days'] = 'Days';
+$string['daysoftotal'] = '{$a->days} of {$a->total}';
 $string['deletecompletiondata'] = 'Delete completion data';
 $string['dependencies'] = 'Dependencies';
 $string['dependenciescompleted'] = 'Completion of other courses';