If I have flight at 11:00 what time should I plan on being at Alamo to return my car?

It did not take us that long to return our car around 10 min But keep in mind that you have to wait for a shuttle so i would go at 8:30 to 9

Total, including shuttle wait and ride, it took us about 20 minutes to get to terminal.

So I'm an employee at Enterprise, National, and Alamo and they're pretty quick to get people returning cars down to the terminal for there flight but it's a busy travel day I would recommend getting to Alamo at 8 or 8:30