Alabama has 1 day voting (with absentee exceptions) and no matter where I have voted (my current place is small), I’m usually in the voting room 5 minutes never longer than 10.
When I lived in Florida, my county had a system where you would get in one line, then when you got to the front you'd go to a desk based on your last name to get your ballot. The desks were arranged something like A-C, D-G, H-J, etc. Every few minutes, a worker would address the big line and say something like, "If your name starts with D-G, come forward". Not just D-G, but anything but M-P, where my name falls. When I'd finally get to front, I'd look at the books and they were all about the same thickness, but people in the M-P book had to wait a LOT longer. Apparently, those with names starting with M-P voted in much larger percentages than those with names starting with the other letters, at least in my precinct. I'd end up waiting 30 minutes or more; others 5 minutes or less. I never really figured it out.