Al Eisner wrote:

Definitely, I've seen 20 minute waits at In-n-Out. And I don't recall
ever having a wait less than 10 minutes. Also, given the atmosphere of
the place (which is very fast-food like) the wait *feels* even longer.

Don't know which In-and-Out that was, but I've seen them serve 50 orders inside
20 minutes with a wait from order to serve on the order of five minutes. Must
depend on the location and the manager.