Update time format of duration

app/helpers/time_helper.rb

@@ -23,4 +23,11 @@ module TimeHelper
   def date_from_to(from, to)
     "#{from.to_s(:short)} - #{to.to_s(:short)}"
   end
+
+  def duration_in_numbers(finished_at, started_at)
+    diff_in_seconds = finished_at.to_i - started_at.to_i
+    time_format = diff_in_seconds < 3600 ? "%M:%S" : "%H:%M:%S"
+
+    Time.at(diff_in_seconds).utc.strftime(time_format)
+  end
 end

app/views/projects/ci/pipelines/_pipeline.html.haml

@@ -45,7 +45,7 @@
   %td
     - if pipeline.started_at && pipeline.finished_at
       %p.duration
-        #{duration_in_words(pipeline.finished_at, pipeline.started_at)}
+        = duration_in_numbers(pipeline.finished_at, pipeline.started_at)
 
   %td
     .controls.hidden-xs.pull-right