Probably not needed but +1 to all of that.
It's so common, particularly with a mix which has issues or right at the start of the learning curve, to spend way more time than can be productive in one sitting.
You get to the point where you're making things worse and thinking they're better, and the first listen the next day confirms this.
It's not something I run into anywhere near as much these days but when I did I made an effort to call it quits for the day at a sensible time,
and make first impressions notes (before changing anything) at the start of each session.
When you sit down to begin play the entire song without touching anything and note down 'snare too bright' 'vocals too loud' 'guitars muddy'.
If you find yourself tinkering endlessly with stuff that isn't on that list, call it quits for the day.
It's even worth doing it with the displays turned off. Might sound silly but try it before you decide.
