Add elpased time.

app/assets/stylesheets/pages/milestone.scss

@@ -11,3 +11,7 @@ li.milestone {
     height: 6px;
   }
 }
+
+.time-elapsed {
+  color: #F14539;
+}

app/models/milestone.rb

@@ -110,6 +110,15 @@ class Milestone < ActiveRecord::Base
     0
   end
 
+  def percent_time_used
+    return 100 if expired?
+
+    duration = ((created_at - due_date.to_datetime) / 1.day)
+    days_elapsed = ((created_at - Time.now) / 1.day)
+
+    ((days_elapsed.to_f / duration) * 100).floor
+  end
+
   def expires_at
     if due_date
       if due_date.past?

app/views/projects/milestones/show.html.haml

@@ -57,6 +57,9 @@
     closed
     %strong== #{@milestone.percent_complete}%
     complete
+    %span.time-elapsed
+      %strong== #{@milestone.percent_time_used}%
+      time elapsed
     %span.pull-right= @milestone.expires_at
   = milestone_progress_bar(@milestone)