> For the complete documentation index, see [llms.txt](https://airian.gitbook.io/airian-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://airian.gitbook.io/airian-whitepaper/runner-x-user-guide/nft/nft-policy.md).

# NFT Policy

If you own multiple NFTs, you can replace one NFT with another NFT 12 hours after you finish using one NFT. The ability to turn off NFT usage is also available 12 hours after use.

The time to replace or release the NFTs, the number of rewards, and details of features or benefits may be changed or discontinued by policy updates.