hamandmustard spot on with your information, certainly the background you suggest is much more common in my area.
I am head of a small primary. After 3 years of 12-14 hour days plus a minimum of one weekend day, I am considering my future. I love my school, have a supportive staff, a supportive and effective local authority, don't have a regular teaching commitment at the minute but have had and will need to again and just know I can't continue at this pace, with this much pressure.
Small schools are particularly hard, the Ofsted framework requirements around middle leadership are impossible. Who leads who, once middle leaders are in place there isn't actually anyone left for them to lead! Some small schools may have only 2 or 3 teachers.
I lead all subjects, we struggle to recruit and retain teachers; budgets are cut so therefore staff, the workload is nearly impossible.
My adage is 'you can't please everyone all of the time' ; actually it feels you can't please anyone for a tiny bit of the time; parents, staff, Ofsted.
Rant over, apologies, post parents evening, not long in, little lunch and no tea! Starving but fairly happy at the minute that parents are happy with their child's progress.
OP if you want any family life at all, you will regret wanting your DH to be a HT. All consuming, even when not working; it is all I think about and when I try to focus on something else, on the rare occasions I have time, I am just too knackered!
Well, off to bed, up at 6.00am to do it all again!