It would be helpful to restrict # of parties per increment instead of max guests. For instance, if we set the max to 8 guests and our increment is 15 minutes, it allows four 2 top reservations in one time slot. We like to limit our reservations to 1 party every 15 minutes and it can be up to 8 people in a single party. For a large establishment, the head count is more useful but in a smaller venue party count per increment is more useful for flow control.