If you're taking 500ug and it just seems longer, I would question if you're actually taking acid or the dosage. That's like 5ish+ hits my dude. Yes, it should be much more intense (and longer). However, you do need to take it all at once. If you wait a couple hours and re-dose, it does just make it last longer.
I'm certain it's LSD25 because if it were anything else (like NBOMe) I would have died by overdose by now. I'm aware the typical dose is 100μg. I've taken up to 600μg before (yes all at once), and it'll keep me wide awake for 24 hours straight but the actual trip itself won't be that much more intense.
I'm autistic and have ADHD so it might affect me differently than the typical person. I don't necessarily like it that way (I would love one of the super-intense experiences that people tend to get really excited over) but so far I haven't been able to cause a particularly strong effect. Very curious why I'm either more resistant to it or more tolerant of it to the point of being underwhelmed.
Don't get me wrong, it's still a very nice experience that I like to partake in every couple weeks. The first time I did LSD (100μg) I got HPPD for about a week, sometimes I wish it never went away. Being sober is so boring!
If you're getting it from the same source, you might want to test it. That doesn't sound right. It should be metabolized well before 24 hours. 6 hits of acid shouldn't last that long, and I'm not sure any dose can.
