with baby zero (no epidural, but medicated hospital birth), sometime after they finished putting in my stitches-- maybe an hour or so after the birth? i was still loopy from the demerol, so i don't remember too well. it was a minor tear that the cnm herself said probably didn't need the two stitches she put in, and, except for being loopy, i felt fine with walking around.
with baby one (unassisted birth), i posted a birth announcement in my blog a half hour after he was born, and then went to take a shower.
i had a minor tear with this birth also, but because of where it was (high on one of my inner labia), it was much more problematic to pee or sit than it was to walk, but only for about a week.