Do you mean a timelock for a multisig to expire? That's what Blockstream Jade does. But what would be cool is a timelock where you can't withdraw the coins or access the wallet (maybe with a passphrase) until a set time.
You're basically talking about regular timelocks then
Bitcoin Time Locking Explained https://www.youtube.com/watch?v=lSgxroGNymM
I hope that guy explains it well enough for you. The other thing I posted might be a little down the line for you to be looking at right now lol.
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