Just posted my first #nostr NIPs proposal. Adding support for mute list expiration for items. If adopted by clients, this would allow you to mute something for a specific period of time (as opposed to the current behavior of indefinitely). Implementation already in progress for #Damus (stay tuned). 
GitHub
Adding ability to have expiring mutelist items by fishcharlie Β· Pull Request #987 Β· nostr-protocol/nips
Iβm working on implementing mutelists in Damus, and users are asking for the ability to have mute list items expire.
After talking with @jb55, on...