That 10 hours per week figure is quite high in my experience. If you hang 3 (20min) sets for an hour per day, and than 4 to 5 days per week; this has been my schedule. I have never hanged 10 hours in a week, but I guess more is more in this game. I gained 2+” in a 3 year time-frame. I guess there is always the need for more.
Take anything and everything that DutyQuest has posted with a large grain of salt.