How long does the outing last?
For example, if you book the following:
16:00 The Laboratory Room
16:00 The Girl's Room
16:00 THE DOME
16:45 THE_DOME
Then the outing will last until about 18:45. So you always start from the last room booked and add 2 hours. This ensures that you have enough time for the escape experience, watching the footage back and reminiscing in the game lounge.
So if you have to take into account a dinner, lunch or other appointment, you can always take the end time of the last booked escape room and add 2 hours for a safe planning!