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Got there around 1am. Was a little concerned with the garage door closed, but it reluctantly opened when I pulled my ticket. Only charged for a couple minutes to add it to my list and it didn't ask for payment on the way out so there is some sort of grace period, but it could be as little as 5 minutes as I wasn't in there long. My guess is it's 10 or 15. I've seen 30 before, but considering this place lists a charge for 0-30 minutes on the sign, I wouldn't think the grace period is that long.