code: def time_estimate(self, duration, **kwargs):
          
          path = '%s/%s/time_estimate' % (self.manager.path, self.get_id())
          data = {'duration': duration}
          return self.manager.gitlab.http_post(path, post_data=data, **kwargs)
docs: Set an estimated time of work for the object.
  
          Args:
              duration (str): Duration in human format (e.g. 3h30)
              **kwargs: Extra options to send to the server (e.g. sudo)
  
          Raises:
              GitlabAuthenticationError: If authentication is not correct
              GitlabTimeTrackingError: If the time tracking update cannot be done