OMG if my acid experience lasted days...I'd just have someone find some anti-psychotics, some heavy benzos, or if none of these were available - see how it worked if someone strangled me til I passed out.
The feeling like I will never come out of a trip has never happened to me before, but I have had such major time dilation where I thought about 6 hours awake, but lying in bed, turned out to be like 2 days - like I'd missed 2 days by tripping and I got a bit scared of this...As long as I was in the correct setting for most of it, and made sure I had good friends with me, I'm sure I could get myself out of any bad thought loops, I've done it before...but days tripping, fuck that's a lot.
A thumbprint literally must be like over a few mg even -think about putting your thumb over a vial of anything crystalline, then turning it upside down - I reckon you'd have more than a couple - scary shit...I've seen some people get violent and act like complete savages after unknown doses, but given the reaction - obviously too much.
I never got scared enough to be violent, just confused and assuming things that weren't real.
The biggest dose I took was 500ug - that was too much for me, it was the first time I'd done LSD in over 2 years, so I can't imagine what MILLIGRAMS would do.