I recall a time where a question would have standing deletion votes, those would remain until the question is deleted (and thus the owner could abuse the system by deleting and undeleting, thus nullifying the previous votes).
However, I saw now a question that was reopened and then closed again, and the deletion votes were gone. Upon checking, the question was never deleted.
So I'm looking for the definitive guide for delete votes anullments. When do they disappear?