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!!!

Weekends and evenings are definitely harder to make happen, but it can be done.  

This is one space where being a bit of a regular can be helpful. Certainly seems like some providers are willing to be flexibility with their schedules with people they have seen previously and have a good connection with.