From What Happened Here? Voted to Close 4 Days Ago, but No Close Votes Today?:
We now use a form of sliding expiration, so as long as close/reopen votes keep arriving at the rate of at least one every 4 days, they will not expire.
Once the votes do expire, vote aging happens every 24 hours, so you can expect the remaining very old close/reopen votes to expire at the rate of 1 per day after that, unless of course someone casts another close/reopen vote in which case the expiration timer resets to 4 days.
Also, if the question has <= 100 views, no expiration on close (or reopen) votes is done at all.
There are two solutions. Well, maybe …
- Encourage our members to visit the review queue for closed questionsreview queue for closed questions more often. But how?
- Ask the SE team to implement this rule on our site:
Close votes (and probably reopen votes) only expire after all of these conditions are met:
- 4 days have passed since the last close vote.
- The question has more than 100 views.