How long does my rate stay firm?

The window is not a marketing number: it matches the typical confirmation time of a send made with sensible network fees. An asset whose price moves little supports a longer window, hence the difference between stablecoins and volatile assets.

Inside the window the announced net is owed, whatever the market does. If your deposit lands after expiry the order is re-quoted at the current rate and you must accept the new amount before any payout leaves. Nothing is lost, but nothing is automatic.

The most frequent cause of overshooting is sending at your wallet’s lowest fee tier.