Hiya Carmel, I usually 'time it' (discreetly of course) from when we both enter the bedroom. If the client has a shower prior and/or after, I include that as part of their booking to stop clients taking the mick and showering for 15 or 20mins, for instance, then adding the booking time on top, consequently reducing my time to shower/bed strip/airing the room out etc for the next client.
I've read on here that some girls are quite lenient on time, each to their own, but at the end of the day, they are paying for your time.
Abbi xxx