Your post reminds me of an article I once read by John McManamy, who is a bipolar author/blogger/commentator. It's called The Bipolar Time Warp and I've linked it here: http://www.mcmanweb.com/bichronic.html

I think the relative experience of time is something that many, if not all of us, go through sometimes. I know I certainly do. Sometimes it's very hard to stay in the moment, and it speeds on by. Other times, I'm trapped in it and it is excruciating. Sometimes, if I try really hard, I can slow it down just enough to savor something...food, sunlight, time with my kids...and I try to just be there, right then.

I think that, as you do more yoga, you will find it easier to be "in the moment". In the meantime, enjoy the journey. It is "time" well spent.