According to the MacRumors Buyer's Guide, it's been 555 days since the last Mac mini update. WWDC is 18 days from today, so that means on June 6 it will have been 573 days, or 1 year 7 months.
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BTW, that 1475 day life span for my 2014 Mac mini is always impressive when I see that table.

Yikes!
WWDC 2022 is a perfect time to announce a new Mac mini, but some of the pundits seem to be telling us to temper our expectations on that. The various supply chain and manufacturing delays certainly aren't helping things either.
Bloomberg's Mark Gurman says the J473 M2 and J474 M2 Pro are both currently in testing, although that doesn't really tell us much about the release date, or even
if it's going to be released at all. In fact, he claims there is also an M1 Pro J374 being tested but I'm thinking that could have been shelved permanently even if it does exist internally at Apple.
Apple Inc. has started widespread internal testing of several new Mac models with next-generation M2 chips, according to developer logs, part of its push to make more powerful computers using homegrown processors.
www.bloomberg.com
Ming-chi Kuo had originally said 2022 for a new Mac mini, but back in March he updated that prediction to 2023.