We've been doing a Fitness Yoga class twice a week for about four years now (plus I started an additional class, not quite so tough, a few months back) so we're quite used to doing 45-50 minutes (the instructor tends to overrun). I wrote down our routine, as well as I could manage, and we've done that so far, but at some point we're going to have to devise a different routine and try to remember all the other moves we're supposed to know!