These are the time periods that apply to maintainer and committer responses to issues brought to their attention via email.
The time limit for a maintainer to respond to a PR is two weeks. After that period, if it is a minor change, any ports committer can commit the change. If it is a major change (e.g. would require a regression run), please contact portmgr first.
Since GNATS does not automatically notify maintainers of PRs, please check to see whether or not the maintainer knows about the PR before declaring a timeout. You can generally tell this from the Audit-Trail and Cc: lines in the PR.
The time limit for a maintainer to respond to port problems (such as build errors, PRs, and needed updates) is three months. After that period, any ports committer can reset the maintainer. If you are a committer and concerned about whether you are doing the right thing, please contact portmgr.
This period may be shortened by portmgr if the email address returns with a hard bounce. In this case, it is probably desirable to reset all the maintainer's ports and change any PRs set to 'feedback' back to 'open'.
The time limit for a committer to keep commit rights within the ports tree ("commit bit") is one year. portmgr will contact the committer by email before invoking this limit.