Question about ethereum gas fees

Kind of a noob when it comes to nft’s but i had a question someone here may know the answer to. Long story short i own an nft on the ethereum blockchain on opensea and would like to list it for sale. In order to list the nft for sale i must pay a gas fee, im wondering, if the nft does not sell in the given time frame, do i lose that gas cost or is it returned to my address? Thanks

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