It depends on what kind of eaters you are, but I would extimate that you will be out of there by 6:30 the latest. We got in for all our ADR's last week early so you have that too. You are about a 5 min walk or so from the Dwarves meeting area. You shouldn't have any problems getting in line by 6:30-6:35 IMO. The line didn't get huge until 6:45 when we went last week.