I agree with Expat with an interval of 1 year.
I think escorts are often flaky and may not advertise/show availability because they are kept busy with 'regulars'. Twice now, a guy has interested me tho he hadn't logged in for some time. As I was visiting his location, I sent an email asking about availability. In each case, I received a positive response, agreed the details of what I was looking to do and had a good time.