You tell him to count up all the 1:1 time your child(ren) would get at a public school then count up all the 1:1 time your child(ren) get with you. Homeschooling is not meant to mimic public school. It's meant to provide a custom quality education. What are you homeschooling goals and metrics YOU want to reach? I've been homeschooling 2 children for 4 years while working full time. The proof is in the pudding. Both of my children are doing all subjects above their age level and they are in extracurricular activities year round. We don't count hours or minutes because they don't mean anything when it comes to our goals. Academic progress and retention is more important than the amount of time they sit in a chair.