I have tried on MANY kinds of meditation: TM, Tibetan Buddhist, Zen Buddhist, Vipassana Buddhist, Sufi (which is dancing meditation), Hindu bhagan chanting, shamanic breathwork trance meditation... and there are probably others that I can't remember right now. I agree with Koan that it's the DOING not the DURATION that matters. It's easy to get caught in the "rules" of a particular school and how THEY SAY to meditate, but in the end what matters is how it works for you. There is no "right" way to find peace. So if you want to do it standing on your head, or lounging in the bath tub, hurray for that!