Anywhere from 6-10lbs. I don't eat nearly enough salt so my water weight gains/losses are really severe.
Once it's over I usually spend the two days after peeing every 10 minutes, and usually end up a pound or so below where I started. It's always surprising since I gorge on sweets during my TOM. I bought a key lime pie last TOM and spent the whole week just pulling it out of the fridge (not even cutting a slice! Oink oink, I know...) and going at it with a fork until I got sick of it. It lasted 6 days and didn't seem to have any ill effects.
God forbid I eat a friggin' steak or something though. I'll gain three pounds that night and never lose it.
