Book two half hour slots, separated by an hour.
Book two half hour slots, seperated by 30 mins
so you can move the car in in on street parking so less chance of ticket
grab a sandwich / drink (none alcoholic) to replace calories burnt off
less chance of her getting a booking in the middle as a lot book hours & would take a leter slot
gives her time to clean up if no booking shower etc & less time between the bookings mean a better memory between the two of your likes / dislikes
This all depends on your own personal recovery time
I often do this in parlours so shag/coffee read paper/shag