looks like the drive-thru hours are 9:00 to 5:00... gee, ya'd think they were cubicle drones or something! but if they don't open the drive-thru till 9:00, you'd be about 4 hours past dawn in summer, although it'd still be the cooler part of the day. maybe time your visit for spring or fall, when sunrise is closer to 6:30 or so... i assume the drive-thru is one-way, and not a 2-lane road?