A good rule of thumb is usually 30 mins = Cum x1
1 hour = Cum x2
45 mins = Cum x1.5?
I don't know really, never done a 45 mins appointment, but I'm guessing you can cum x2 if you are within the time.
Most, not all, but most, escorts go by cum however many times you can manage yourself within the time booked. To be sure, it's always best to enquire over the phone when making your appointment and make sure you confirm in person again at the start of an appointment before any cash changes hands.
If you choose wisely, it shouldn't really be any problem. I think you will generally find that escorts that charge the more basic rates shall we say, i.e. €100/hour are more strict about how many times you may cum, usually once and shows over whereas escorts that charge say €160 and upwards per hour will usually work off the "cum as many times as you can manage in the time paid for" scenario.
My own recommendations for Cork at the moment would be:
(just click on the names)
Honey
Eniko
Dianaxxx
Patricia