It depends on when exactly you get to the shuttle place. They leave something like every 5-7 minutes, but they could wait an extra minute if there's someone getting their stuff out of their car. Once the shuttle hits the road, you're in it for, I think, less than ten minutes. You could Google map it, from the parking garage to the terminal you need and see exactly how long- I think it's less than 2 miles.
No more than 10mins providing traffic isn't bumper to bumper
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