One of the very first things i learned when i began homeschooling was that 9 to 3:30 schooling simply exists for parents work schedules. We can typically knock out our school day in 2 to 3 hours altogether. Granted, my kids are still elementary age
Also consider school holidays. How many jobs let you take 12 weeks of holiday a year?
I've asked loads of working parents how they deal with that and the answer is always "it's impossible, you have to use grandparents, scrounge together enough holiday, try to take unpaid leave, etc.".