Even if you were a long-time k-client, you probably wouldn't get a response that late. Look at the CV ads. Many of them note the proper hours. And as the previous poster suggests - do a search and read, read, read. You'll figure it out eventually, if you are persistent enough.

Yeah, most Kgirls have a set schedule that they work.   You may find some independents that work late though.  

The annoying thing now is that many want to have references, so you'll need to find a girl or outfit that either screens lightly or doesn't screen.   See that girl once or twice and then you have a reference and can start branching out.   Don't wait to long though since you don't know their schedules and the provider you want or your reference may move on and then you'll have to start over again.