--- a/candolint/models.py	Wed Jun 15 23:49:22 2016 +0800
+++ b/candolint/models.py	Thu Jun 16 07:31:39 2016 +0800
@@ -84,3 +84,11 @@
 
     def get_url(self, request=None):
         return '{}/{}'.format(self.project.get_url(request), self.ordinal)
+
+    def get_duration(self):
+        d = self.finished - self.started
+        minutes, seconds = divmod(int(d.total_seconds()), 60)
+        if minutes:
+            return '{} min {} sec'.format(minutes, seconds)
+        else:
+            return '{} sec'.format(seconds)

--- a/templates/check.html	Wed Jun 15 23:49:22 2016 +0800
+++ b/templates/check.html	Thu Jun 16 07:31:39 2016 +0800
@@ -24,7 +24,7 @@
           <dt>Finished:</dt>
           <dd>{% module Time(check.finished) %}</dd>
           <dt>Duration:</dt>
-          <dd>{{ check.finished - check.started }}</dd>
+          <dd>{{ check.get_duration() }}</dd>
         </dl>
       </div>
       <div class="uk-width-medium-2-3">

--- a/templates/index.html	Wed Jun 15 23:49:22 2016 +0800
+++ b/templates/index.html	Thu Jun 16 07:31:39 2016 +0800
@@ -17,7 +17,7 @@
             <td>{{ change.rev }}:{{ change.node[:12] }} {{ change.branch }}</td>
             <td>{% module Time(check.started) %}</td>
             <td>{% module Time(check.finished) %}</td>
-            <td>{{ check.finished - check.started }}</td>
+            <td>{{ check.get_duration() }}</td>
           </tr>
         {% end %}
       </tbody>

--- a/templates/project.html	Wed Jun 15 23:49:22 2016 +0800
+++ b/templates/project.html	Thu Jun 16 07:31:39 2016 +0800
@@ -25,7 +25,7 @@
             </td>
             <td>{% module Time(check.started) %}</td>
             <td>{% module Time(check.finished) %}</td>
-            <td>{{ check.finished - check.started }}</td>
+            <td>{{ check.get_duration() }}</td>
           </tr>
         {% end %}
       </tbody>