If it's a decent - weather day, especially on the weekend, you can expect to have to wait in line for possibly an extra 10 - 15 minutes on top of the prescribed time it takes for the selected service. That being said, they move through as quickly as they can but they also want to ensure each customer is completely satisfied with the work being done and that, to me, is worth a wait.
It depends what kind of detail your gift certificate is for. It could be 10 minutes, 30 minutes, 1 hour or more.
10 minutes for a basic interior + wait time if there is a line
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