We have the same setup but at Garden Grill instead. At least for Garden Grill and Biergarten, 4:10 was the latest seating that was permitted with the 6:45pm show (the CM I spoke to said the 4:20 seating at the restaurants only had options for 8:00 when she looked). I am assuming 1.5 hours for dinner which would still leave an hour before CP starts to walk around for a few minutes and then head back to the theater to be seated. I do plan on checking in about 10 minutes early.