Hallucinogens, in all their forms, typically have very similar effects on someone physiologically speaking. Most hallucinogens are 5-HT2aagonists, it is understood that this receptor is responsible for hallucinatory experience. 5-HT2a also has a part to play in mental illness like; eating disorders, Schizo affective disorders, bipolar, depressions, and substance abuse. It is hard to talk about tolerance for me without talking about addiction potential. There is not a whole lot of conclusive data on this topic either as the prohibition has limited the world’s ability to do good science. I will have to fill in some gaps on the data with other similar tryptamine experiments going all the way back to the experiments of MKultra. 

Tolerance is defined by the body’s lack of response to a given substance. Over time tolerance will build with continued exposure to nearly any chemical. The tryptamines inside of mushrooms, cacti, LSD, MDMA, etc… all build a tolerance within hours of consumption (NOT DMT). When tested on mice, they respond with head twitch response (HRT) and we use it as a  way of knowing the drugs have taken hold. It took 24-48 hours for the second dose to reproduce a HRT. The hypothesized mechanism at work here is that the 5-HT2a receptors are being down regulated after dosing, not allowing as many tryptamine molecules to “lock in” and thus resulting in a less powerful experience. This is where many people are fearful about addiction potential, I have to now take double the dose I did yesterday to feel the same way. Addiction potential when medically speaking has several key factors, one of them being tolerance. Many of the studies I have seen disregard this fact when talking about hallucinogens, it is because it is mostly negated by the facts of the several self administration studies. If you’ve ever tripped really hard, the last thing you wanna do is trip the next day, and the mice studies all agree.  The fact is though, everyone’s body is different, we have different serotonin levels, metabolisms, weight, height, age, medications, other hormones, etc… Everyone is extremely different. Trying to put a time stamp on when it is good to go again? Basically impossible. 

TL;DR we don’t know exactly how many days everyone should wait to trip out again, probably never can. At least 24-48 hours according to the mice.

 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4309922/#B22

https://link.springer.com/article/10.1007/BF00407974

https://link.springer.com/article/10.1007%2FBF00409110