We waited almost 90 minutes for our dinner ADR at BOG last year. Needless to say, I was quite annoyed. Then we ended up getting seated in probably the worst table in the restaurant, in a far corner right of the ballroom next to a service cart. Hopefully my experience isn't typical though. Even though it is a party night, you can still finish your meal at a normal pace. If it's after 7:00 when you leave, you'll be asked to leave the park, but you can still sneak a peak at the party activities while you're walking out.