If an ALEX drawer unit takes them over an hour and a half to build, IMHO they're doing something wrong. Many others on that list seem suspiciously high (the BRIMNES comes to mind). Curious how it came up with those values.

Sloppily. I doubt there's much information on the web that says "mounting a BRIMNES takes five hours, twenty minutes." So what's an LLM to do? Produce any number in the semantic vicinity of the sequence "mounting"+ "BRIMNES" + "takes". So that can be anything that says "building an IKEA closet cost me" or "climbing mount Bayimes takes on average" or perhaps even "building a mountain bayke [spelling error] can take". And then from all sentences that get close to that point, it takes the next likely token. So 320 minutes it is.