If you have missed the chance to approve the release of funds within the 1-hour limit, the transfer will not go through and is considered unsuccessful. the funds will remain on your threshold signature (TS) vault. In such cases you can either choose to revert the amount back from the vault back to your private wallets, or keep the funds inside your threshold signature vault and use them to create or participate in other offers.

Why is there a 1-hour time limit on the deal process?

This time bracket is made purposely long enough to perform a deal-related routine even on such slow blockchains as Bitcoin while still reasonably alleviating any risks associated with rate fluctuations.