An NFT that changes based on how long you own it means that the digital artwork will evolve over time as long as you possess it. This feature adds value and interest to the NFT, encouraging the collector to hold onto the asset to witness its development and growth.
Having an NFT that changes based on how long you keep it is more desirable for collectors. This encourages collectors to hold onto the asset for longer periods rather than reselling it quickly.
This concept adds value to the NFT over time and creates a sense of rarity and exclusivity, making it more desirable among collectors.
Example
The Proof Collective's Moonbirds serve as an example of this type. Link: www.proof.xyz/moonbirds