Yeah acid is heavy body load, I've had trips lasting in excess of 15 hours
By the end of it you are shattered but you can't sleep because your mind is still trying to catch up and process everything
Your body just lies there lifeless whilst your mind is still racing haha
smoked crystallised DMT trips only last around 10-15 minutes
oral dmt (ayahuasca) can last for many hours though,
It's what the tribes people in the amazon use for their spiritual rituals, crazy
don't think I could handle 15+hours of a dmt trip though.
I found a thread once where a guy had taken DMT through an intravenous drip, straight into the bloodstream... It sounded like the most intense thing ever.