I am personally a night owl and would find it helpful if the time was listed in the reviews, it doesn't have to be exact but an estimate would help a lot. Either that or the providers may consider adding this into the profile. There's plenty of ladies I'd like to schedule with, especially since urges seem to creep up in the evening, but I don't want to call to late and be seen as a weirdo, does anyone else find this to be a similar situation for them?
If you look at their ads, they usually state time of availability. Keep in mind though, that those who offer "24/7" still need to sleep and you shouldn't expect a short notice visit.