They are usually dead within 3-4 minutes. They may not fall off, but will shrivel up and disappear quickly. You won't need to reapply to the same aip unless you missed the first time. You will want to watch for the new crop of aips that's going to come up. Peppermint shrimp will often eat the small ones.
Life is not measured by the number of breaths we take, but by the moments that take our breath away.