That’s 5x the recommended max single dose, and 2.5x the recommended max daily dose (obviously depends from person to person and on body weight). I don’t think it would be lethal, but the symptoms would still suck - racing heart, shaking hands, quite often psychological symptoms like anxiety/panic… The worst part of caffeine OD is that it gets metabolized super slowly (half life 1.5-9.5 hours), so after 10 hours you might still experience those symptoms, and there’s simply nothing you can do. Speaking from experience here, although it was less than 1000mg. If this story is true (which it very well might be) I feel for OP.
As someone who’s consumed that much caffeine in far too short a period, you pretty much nailed it. It’s not a fun time.
I’m trying to remember how many, but when I was 19 I worked at Starbucks and wanted to see how many shots I could handle in a day. I had a rare 8 hour shift and my memory wants to say it was 23 shots, but I’m really skeptical about that number since my memory during those years I pretty foggy due to some serious depression. I’m positive it was in the teens at least though.
To say that day sucked is an understatement.