--- a/candolint/models.py	Fri Jun 17 19:09:13 2016 +0800
+++ b/candolint/models.py	Fri Jun 17 21:21:13 2016 +0800
@@ -88,7 +88,9 @@
     def get_duration(self):
         d = self.finished - self.started
         minutes, seconds = divmod(int(d.total_seconds()), 60)
+        result = []
         if minutes:
-            return '{} min {} sec'.format(minutes, seconds)
-        else:
-            return '{} sec'.format(seconds)
+            result.append('{} min'.format(minutes))
+        if seconds or not minutes:
+            result.append('{} sec'.format(seconds))
+        return ' '.join(result)