As a guest, if your invite says 5:30, do you plan to be in your seat and waiting for the ceremony procession at 5:30? Or do you plan to get there at 5:30, park, and find your way to the seats?
At your wedding, did your ceremony actually begin at the time stated? Or did you factor in an extra 10, 20, or 30 minutes so there's no late walk-ins during the procession?