With 24-hour notice, we can push your tour out to a specific time (depending on venue availability, and if no other tours have been booked for that day). With less than 24 hour notice, the tour guide will arrive promptly, and the clock will start. However, the tour will not board the van until the Responsible Party states that it is time to board. In the case of a late start, the guide will talk to the Responsible Party and ascertain her/his preferences. Additional time above the tour window will be billed at $70/hr. If it is a mixed tour and not just one group, the tour will leave no later than 10 minutes after the scheduled departure time.