If you really over-eat on occasion, how long does it take for the extra weight to show up on your body and on the scale?

Is it a matter of hours, 24 hours, or days? I have been known to eat an entire Sarah Lee cheesecake in just a couple of hours. That’s far and above my usual calorie intake. And the reverse…if you don’t eat for a day (which I’ve been also been known to do on occasion) how long does it take for any weight to start dropping off?