I guess everyone is different, but when I have cheated, I go to induction again immediately (or the next day), even if I cheat for 1 meal. The reason is, while I don't see an immediate change, I know my body has reacted and takes it about 3 days to get back to normal.

At the same time, cheating puts weight back on me, (probably water weight) and that can take me up to a month to get back to the weight I was at before I cheated.