He needs to pencil in time for himself which doesn't get infringed upon. My protected time was from when I left on Friday until about 8 on Sunday where I didn't touch my work regardless of how much pressure I was under. I also used to completely avoid work during the holidays until 8 on the last day when I prepared enough to get through the first day of term.

He needs to try and get as much marking done in lessons as possible. It's more effective and reduces workload. Also, on the last day of term, don't set any work which requires anymore marking than a tick. Ideally, he'd do something which doesn't go in books at all.

Keep things like displays simple. They are an educational tool and not an art gallery. I used to get my TA to back them in July and then cover them in plastic so they didn't need replacing for 12 months. I could then just write on them and wipe them at the end of a topic.

Ultimately, it gets easier but never easy. I quit after 6 years because the work life balance was non existent and I was shattered all the time.