Missouri counts hours. The easy way is to log them as they happen.

Missouri is the state that counts homeschooling in hours — a thousand of them per term, split by subject and by location — and asks for the written record to match. Missouri homeschool families keep a plan book or daily log, a portfolio of the student’s work, and a record of evaluations, with at least 1,000 instruction hours per term (Mo. Rev. Stat. §167.031). A family either logs the hours in the minute it takes each day, or sits down at the end of a term and tries to reconstruct a year of them.