I've seen it take as little as 15 minutes, but as much as an hour during peak times. Calling ahead while on your way to Costco should have your pizza ready by the time you finish your shopping.
Depends on how busy it is. It only takes them 10 to 15 min to make it but it its on a Saturday and the lines are out the door you might want to order it before you do your shopping.
10 to 15 minutes before you want it.
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