£60 for 3 hours sounds like a bargain, what's the m/f ratio like there?
One thing that concerns slightly is I can only cum once in a day right now due to the medication I'm on, but would the girls mind if I spend 10 minutes with one, don't cum, but then head off to fuck someone else for a while, etc, etc, and then just finish at the end? I wouldn't be expecting three hours of solid sex either (and I'm really not fit enough for that!) so would have no issues taking time out as I wouldn't ever want to be the kind of punter who hogs a girl.