What is the minimum time between tours that should be allowed?

As a practical matter and based on the experience of many conventions, booking tours with much less than 30 or 45 minute headway carries a risk and a 15 minute headway is very risky. We can not hold up an afternoon tour because a morning tour is delayed and our policy does not allow for refunds for tours missed because of a missed connection.

We realize that some tours are booked with close headways due to a variety of scheduling constraints that we took into account when we set up the schedule. Since different buses may be involved with the two adjacent tours, you should not assume that your bus being late will delay the afternoon bus -- though that is possible if the two tours do happen to share the same bus. We do not have that information (it will be controlled by the charter bus company) so we couldn't advise you on that detail in any case.