It will move either up or down within, I'd say, an hour or two at the most. The body is NOT happy with something actually stuck in the stoma, and that's part of what causes PBing (when food comes back up). It's not exactly "vomit" because there is no stomach acid involved, but it is regurgitation.
Sometimes the stuck thing can go down, too. When that happens, you feel instant relief. There's all sorts of different ways it can resolve, but resolve it does sooner or later.
__________________ 
~~ Alexandra
banded 8/20/03
band removed 4/9/07 due to slippage REbanded 8/13/07
340 highest / 210-ish lowest / 275-ish now / less
5'10" -- size 28/30 then, 18/20 now | 