When we get times like this because that's all that's available, we use the 15 grace period to our advantage. We also have a BOG at 4:30 one of our nights and we plan on showing up at 4:40, requesting a specific room to sit in to help delay things even longer, and knowing it will probably take at least 10-15 minutes to be seated. We've never been seated right at ADR time at BOG. Once you sit down, it may take a while for your server to show up, but once they do, the meal is pretty well paced. You can ask the server to give you 10 minutes to look over the menu, once you get your drinks. Food does come out quickly, but not as fast as it does at lunch. It's definitely possible to make it so food doesn't hit your table until closer to 5:30.