Hitting a max of 3 mobs session is a good guideline to follow. You don’t want to do too much at once.
You could do 1-2 upper body and 1 -2 lower body mobs in the morning and at night.
If you are able to do a 3rd session during the day great. If not it may be getting 1-2 minutes at different breaks within your day. But don’t stress about it.
The more your body has the stimulus and the reminders during the day you’ll start seeing improvements.
Areas with alot of restriction can be slow moving in the beginning and once you start to see improvements it can be the start of a chain reaction. Once one thing is figured out you’ll see other aspects start cleaning up.
Feel free to message me with another questions. Keep chipping away at it.