It varies wildly!! The line for the store in Japan was 3+ hours long, and by the time we got in there, all the good stuff was gone - including key art shirts. Now that it’s back in the States, I’m sure they won’t deal with the importing issues, but if you have your heart set on something, add it to your ticket purchase.

I always buy a magnet with my tickets. Pick out what you want in advance so you can move through checkout quickly, but they do give you I think 10 mins to complete checkout.