I would not describe any of them as "pretty quick" but I do know how long it takes to cook a burger and it's never as long as I'd have to wait at these shitty places: It sure as shit doesn't take 10-20 minutes to cook a burger. These corporations understaff their restaurants and pay shit wages, so, of course, they don't get very good employees (or even if they do, why would they try very hard for that pay?)