I’m a rising Senior and I’ve taken 8 AP classes so far. By the time I graduate I am set to have completed 13
But the previous comments are correct, it’s all relative to your school and more than that, your personal goals.
I made a conscious decision not to take Studio Art and Music Theory because I intend to be a Stats major. Instead I’ve used my electives to take Stat and AP Capstone (for more of a passion project)
For context my school offers 21 AP classes (though I don’t know the average taken) and doesn’t offer Honors or IB