I take great offense to your comment that girls who offer 30 mins or 1 hour can not be given the same classification as some one who offers longer. Surely it is the gentleman that dictates the length of the service he requires and the lady adapts her service to the gentleman's requirements?
Believe me it would be a delight to put my post grad to good use on someone who wanted to converse with me, wine and dine me and spend a longer period of time with me, but we are going through a recession and I believe in equality, which means I try to make my services accesible to anyone who would like to be entertained by a lady who puts 100% in to her work, be it for half an hour or overnight.
Please do not make assumptions!
I would also like to say that some of the gentleman that I have met for 30 mins have been perfect gentleman too. Clean, respectable and even had the money in an envelope! Who would have thought?