As far as I’m aware the most widely-accepted standard for responsible disclosure is 90 days. This is a little different, since that’s normally between businesses and includes the time needed to develop a solution; it’s not typically aimed at federated or self-hosted applications rolling out an already-created patch. On the one hand, granting them that extra time to upgrade seems reasonable. On the other, wouldn’t anyone wanting to exploit a vulnerability be able to reverse-engineer it pretty easily by reading the git history?