What is your current fitness level? To really appreciate the trip and not have to push yourself all the way through I'd plan more for 7 hours with a couple of stops in there. Heck, if I was doing this with my wife I'd say we would go for 8 hours. Take an hour lunch somewhere, a couple of breaks before and after. Maybe maintain like 15 mph avg speed while riding.

As far as racks/panniers Axxis has a sport touring line. However, you may be able to get away with a trunk bag on a rack and no panniers. Not like you'll be bringing cloths and I presume you'll have pre-made meals so no reason for cooking utensils?