Gordon todd skinner explains of two separate occasions in which firstly william leonard pickard accidentally spilled a massive amount of LSD, each cycle ran 10-14 days but they worked for 5 weeks so 998 grams in 5 weeks and around 200-500 grams per 10-14 days, so probably fair to say over 10 grams spilled on him. He was tripping so hard no one could even communicate with him for well over 30 hours. Another incident involved non cleaned lab equipment and a "worker" of the conspiracy was dosed off a unknown amount and was beyond communicable for 32 hours and each time leonard and said "worker" were said to have been in a psychedelic state the entire time and that their trips lasted well over 40 hours. So just do your reading and it will show that it is very possible to trip on LSD for over 8-12 hours.
Source: UNITED STATES OF AMERICA, Plaintiff, vs. WILLIAM L. PICKARD and CLYDE APPERSON Case No. 00-40104-01/02
These men were known for taking heavy doses. Having iv drips of dmt going all day and taking straight crystal. I think they know what they are talking about.