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

def time_estimate(self, duration, **kwargs):
        """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
        """
        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)