I suspect mostly the former, as many instructors devote most or all of their evenings to classes, anyway. And it's MUCH easier to budget your time around getting to classes 2-3 times a week for a couple of hours, rather than managing to stop there every day on the way home from work for 15-30 minutes. And if you add in the need to travel, warm up, and change clothes, it doesn't add up to the same time commitment.I imagine the 2 hour training session, once or maybe twice a week was devised to fit in with studentās work/life and the teacherās convenience.