Don't stress yourself, you really can't control anything about how much time owners have to spend on this site, how often they're online.
Remember, the top 240 players are already off the board, the only high value players who haven't been picked yet are ones with significant injury issues.
(Including that ridiculous Darin Kimble, who I think is the single dumbest player value in the entire database.)
I would think two rounds per day is alright. If there are owners who aren't able to make it, maybe we (or you, or I, or someone else) can go ahead and make picks for them.