# Swap Expiration When creating a swap users can specify a date at which they'd like the swap to expire. Once a swap expires it can no longer be taken by any user.\ \ Swap expiration dates are approximate because NFT Protocol is only able to allow swaps to expire at a specified block height. The application estimates what the block height is likely to be at the chosen expiration date and programs the swap accordingly. Because block times vary it is not possible to program a swap to expire at a specific point in time.

Users can specify an expiration date via the ADVANCED drop down menu on the NEW SWAP page.

The block and approximate date at which a swap expires can be viewed on its SWAP DETAILS page.

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