Almost exclusively weekday mornings.  

I simply have more free time and seldom have to worry about traffic.

I still work part time but on my own schedule....that being said, I am a tuesday, thursday guy but if i can visit someone on saturday that is great too.....and an occasional Sunday works also. Over the years I have never been shut out on the weekends so just keep looking, the ladies are out there
 As a regular over the years maybe sometimes that helps too !

Some escorts only work daytime, some only weekdays.  They have to fit around their own schedules.  Some have day jobs but work from home.  

Anyhow a good time of day for me is after work when I have to drive across town anyhow.  

I'm available on weekends – if gents can plan in advance

If you can plan at least 2+ days in advance, some ladies might make an exception for you. It also depends upon your relationship/interactions with that lady or ladies.  

Personally, there are a handful of gents that I would happily see almost anytime – even late nights – because they're fun to be around. I've rescheduled plans with friends to see one of my atf's!!!