If the lessons are done on a regular basis (I do them daily) then I don't think they go longer than a school year. But it would be easy to do the breakdown by looking at the outline for the grade l...

1. Közösség
2. Classroom Tips and Tricks
3. Math as full course

I homeschool too and we've been using their math with grade levels as our full course for a couple of years now. I don't know why it would be considered just supplemental.

1. Közösség
2. Classroom Tips and Tricks
3. Math as full course