docs: def _get_minutes(self, duration):
          """
          Calculate the number of minutes with the given duration.
  
          :param duration: The duration
          :type duration: int or datetime
  
          :rtype: int or None
          """
          if isinstance(duration, datetime.datetime):
              from_now = (duration - datetime.datetime.now()).total_seconds()
              from_now = math.ceil(from_now / 60)
  
              if from_now > 0:
                  return from_now
  
              return
  
          return duration