

There’s a penny arcade comic that makes a good argument. About printing out your character as a figure or something they have/had. Heck I wonder if it that was part of the reason, unsure if it’s still offered.
I always enjoyed the bit of making my character looked like how I preferred though it wouldn’t detract me overly if I wanted to play. I play sometimes but not often.
Never looked into the half life but first time it took like 6-7 hours to see the ceiling swirl nicely. I wouldn’t assume many days lasting though. The wired framed mech I wanted to see out my 3rd story window at like 4am was beat though, especially when I made it walk back and forth.
But after many times, including after seeing the Teletubbies sun face randomly (actually not even the most awesome hallucination that trip), after 12 hours I was mostly sober.
Other time I recall was about 10 hours after first dropping went to a rave and got home,I saw some fun colours in the shower water, into infinity between the tiles, then yelled a Madeline cartoon cause they left their luggage 3 scenes before they checked in and had it next to them again…then went to bed and was all tired later cause my sleeping schedule was mixed up.
I wouldn’t think it last longer than say 12 hours unless other factors are in play.
Edit forgot to say, most of my acid trips I saw no more than stucco ceiling swirling for a hallucination. So don’t take these experiences as standard…well maybe the watching that Madeline episode that was stupid continuity but expected for a tv show made for kids.