Duckman's original post about this procedure was concentrating on how to do this on pinkies (less than two weeks old).
So Duckman stressed getting the water out of the bladder. Because a pinkie has a very small bladder and only pees when stimulated.
Your baby has a very big bladder, and is old enough to pee when he wants to.
If, after about 4 water feedings he is not pooping yet... it should be safe to drop back to every other hour. To let him (and you) rest a bit.