I started out with a half quart and gradually got up to two quarts over the course of about four months. I'm at 2 quarts now, and I think that's my limit, cause it really distends my belly.
Is it possible to hold it for several hours? Can that be done? I've read stories here in the Library about it being done, but that's fiction and I've never tried it for extended periods of time. The longest I held it was 4 orgasms, which is about 15 or 20 minutes for me. How long is too long?