Hey, welcome to this mishmash of a collective. 
As for figure drawings, I just do whatever the light is like that day. What I mean is, it’s usually 3 hour session with 30 sec to a minute to warm up for the rest of the session. If it’s good light then longer poses like 45 minutes. If the light is, say overly cool or warm I try to break it up to multiples of 10 to 20 min drawings.
Sorry for the lateness. I’m in the middle of trying to post here more often, but I’m learning all the software knickknacks to be comfortable enough to post polished things in this place.
Anyway, again welcome and we may bump into each other again in the future. Take care and stay safe.