Unless I time it right, my 3-day rental with Alamo will incur an extra hour charge. So.....if I've reserved a car for 8 pm and I pick it up at say 8:30, does the clock start running at 8:30? And on dropoff, do I get a grace period that will extend the rental until, say, 8:59 3 days later? Or some other grace period, or none?

Thanks....I am a Quicksilver member and reserved through Alamo's website, if that makes a difference.