Peter N. M. Hansteen@solene for the spamd generated list, the expiry is 24 hours (IIRC counted from last seen activity). For the others it's six weeks similarly as described in "Badness, Enumerated by Robots" https://nxdomain.no/~peter/badness_enumerated_by_robots.html.
I offer removal for the kinds of situations you mention (https://www.bsdly.net/~peter/traplist_ethics.shtml) but I have only ever received removal requests for outdated entries and for hosts still actively spamming for some reason.
I tell them to fix, I will provide evidence for handing to law enforcement.
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