To rule out the possibility of a post-op leak, I did a swallow test the morning after my surgery (with a thinner liquid, not that chalky stuff). I got to watch on the monitor as the liquid went down my throat, into my pouch, and through to my intestine in the amount of time it took for me to carry on some chit chat with the imaging tech. It was less than a minute before the liquid was nearly all gone from the pouch and traveling through my intestines. Having watched it with my own eyes, I feel the evidence is pretty strong that waiting a full 30 minutes to "empty" your pouch of water is nonsense.