I've been meditating (breath-based) daily for about a year now. I started off small and gradually increased to 30 minutes, 45 minutes, and finally one hour sitting sessions every day, for about the past month. (Sometimes augmented with 30 minutes more when my wife gets home from work.) These sessions have been good. As I've increased the time of the sitting, I feel that I've been able to go deeper (calmer mind, greater mindfulness, funky feelings (piti?), etc.)
This past weekend I decided that I wanted to try sitting for a few hours. I set my timer for three hours as a start. It didn't go well. Past the one hour mark, I was more restless than usual (possibly because I was in pain at various points), and couldn't really stay with it. I made it through the full three hours, but I actually felt pretty bad after that. There was a backlash of non-mindfulness for the rest of the weekend. Woops.
Perhaps my problem was too much confidence (expectation) because my daily meditations had been good. Going into the three hour sit, I told myself that I had no expectations, but it would have been nice to emerge a Buddha...
Anyway, I'm concerned because I'd like to go on a meditation retreat eventually, and I'm worried that I won't be able to do it. Any suggestions for increasing sit time? Should I just let go of my expectations and reattempt it? Should I wait and stick with my daily meditations until my mindfulness is strengthened further?