there are so many different strains of mushrooms with such varying levels of potency that if you ate 10 random eights of mushrooms from different people each trip would be different and obviously the more potent mushrooms will make you trip longer, also some strains have more visuals or more of a body buzz, and the potency also depends on if they were grown and harvested correctly, this actually is funny because i am writing a paper in my philosophy class describing an insane trip i had, I ate a single mushroom that was just over 4 grams, which is another important thing caps have a higher percentage of psilocybin than stems so you would also trip way harder if you ate 4 grams of stems than 4 grams of caps, but back to my story the cap was pretty much most of the weight of the mushroom i got and not only was i eating almost 4 grams of only cap, I was one of the first people eating these mushrooms from a pound that my buddy got from New Mexico, so noone had told him how strong they were, they ended up being retardedly potent, and i ended up laying down in my bed and having a rediculous out of body experience that lasted for probably four hours but felt like way more that, i had strong visuals still ten hours after eating the mushrooms, later when we later identified what strain it was, we saw that is had something like 3x the potency of normal mushrooms, there are a few super-potent strains out there, so if you get mushrooms go to erowid and they have a mushroom identifier and there are probably ten characteristics they list off so its easier than you would think to find the actual strain, but even that doesnt tell you much, theres honestly no way of knowing unless you eat a half slice and judge how hard you trip, then depending on that buy more or less but it has to be the same batch of mushrooms from the first time for you dought them