During my upcoming vacation to Iceland, I am planning to do a complete trip around the Hringvegur. Because the Eastern part of Iceland doesn't have very many landmarks, I am planning to drive from Mývatn to Höfn (a 360 km stretch) in one stretch. I am hoping for this to take around four hours, but considering the fact that there are some dirt roads, I get the feeling I may be underestimating this trip.
Can anybody tell me how many kilometers of dirt roads there are in these parts of the Hringvegur? Is it possible to get through these parts of the country in 4-6 hours? If this takes very much longer than that, I may have to revise my planning a bit.