I stopped reading the article after he admitted that part. What a waste of a setup to ruin the experiment with a completely pointless test.

I usually try to use my beans within two weeks (and after around four days resting period) after roasting. But we have pretty bad humidity here so maybe you could keep it longer elsewhere.

As for after grinding - you can't really expect it to produce a decent extraction even _ten minutes_ after grinding.

Ah, you're right. I read too fast.