I've seen you've been blocking people with expiry times like 100 years or so. What we call that here are 'childish blocks', where some staff member blocks someone with a valid reason, but with an invalid expiry time. Next time, block people indefinitely, but don't set it in a childish way. I literally have to fix all the users you and Xal childishly blocked before. Hope I don't have to do it again.
Maybe he just didn't think to set it to indefinite, or infinite like I do, he was just trying to stop the vandal in the quickest way possible, and 100 years is pretty much infinite in terms of one person's lifetime.