It varies on the individual, probably due to body mass and so on. Even then, it's not like a certain dose will guarantee a certain experience. I'm a ~72kg man and I'd say 3.5g is a normal dose and 4.5g is verging on high. The most I ever had was around 5g.

The two truly profound spiritual experiences I've had were actually 22g "High Hawaiian" magic truffles (not mushrooms, but similar), and around 5g cubensis magic mushrooms, though I did eyeball it so it may have been more or less.