Op - WHY do you want to do an overnight? do you think YOU could shag for say 10 hours near continuously? Maybe ask yourself how long do you typically last? what is your recovery period? Bear in mind it usually gets longer between 2nd and 3rd time than 1st and 2nd and longer again between 3rd and 4th etc.
would you be better with just a 3 or 4 hour slot as you suggested?
For me, overnights are indeed in a different class to an hour or two of sex. However mine are all with SB's (ladies from "seeking") and therefore i have got to know them and them me, we have had dinner and drinks etc, we get on really well together as people/friends and not just as a paid fuck and the quality of sex is just so much better because of all that. but even so (and ok i am now about 60) and even with the hlp of a little blue pill, on the rug in front of the fire, when we go to bed, maybe if we wake in the middle of the night and finally in the morning is about it! But with such a lady, a bit like a civvy maybe, the cuddling and pillow chat is all part of it. not sure you would get the same level and benefit from a AW type lady.
So maybe ask yourself what is the real important bit for you.