That said, 2 hours is a pretty extremeTM amount of time to meditate every day. Fifteen minutes, give or take, will still go a long way. (Fifteen minutes in the morning AND before bed is even better, though, and who doesn't spend half an hour a day just farting around?)
Yes, I don't mean to imply that two hours a day is a necessary threshold. I brought that up in response to the statement about exercise, to highlight how valuable it is to me.