new_contents: import os
  import datetime
  from datetime import datetime, timedelta
  
  
  class CallbackModule(object):
      """
      This callback module tells you how long your plays ran for.
      """
  
      start_time = datetime.now()
      
      def __init__(self):
          start_time = datetime.now()
          print "Timer plugin is active."
  
      def days_hours_minutes_seconds(self, timedelta):
          minutes = (timedelta.seconds//60)%60
          r_seconds = timedelta.seconds - (minutes * 60)
          return timedelta.days, timedelta.seconds//3600, minutes, r_seconds
  
      def playbook_on_stats(self, stats):
          end_time = datetime.now()
          timedelta = end_time - self.start_time
          print "Playbook run took %s days, %s hours, %s minutes, %s seconds" % (self.days_hours_minutes_seconds(timedelta))
  
  
  
subject: Add simple plugin that times ansible-playbook runs.