I generally do like during the morning, such as 10 or 11am as this allows you to eat light, prep for strapon play, and see then before they've had a busier day and have cleaned the dungeon multiple times (hopefully).

I generally try to avoid weekends as that's when all the brokies who have to work during the week want to session and places are generally more crowded.

There is something that seems more traditional when sessioning at night, such as 8pm or later. It just feels more BDSM-ish whereas I treat the daytime 10 or 11am sessions like they were just a massage therapy appointment and more of a fetish activity.