“Most of these garages will have a grace period so that if you pull in but you didn’t really ‘park,’ you can leave and pay nothing. […]
"Next time you park in one of these garages, grab a ticket like normal and go park. When you’re ready to leave, pull your car close to the entrance, and go push the button to get a fresh entrance ticket, time stamped to that moment (when you’re ready to leave). Then, just go to the exit and put your brand new ticket in the machine or hand it to the person. If you’re within the grace period, you will be charged nothing and you can leave. […]
"Even if you’re a few minutes over, you’re paying for minutes rather than hours or days."
- Anonymous