> 10 hours of driving over a 3 day period

Since you're trying to be pedantic about trying to calculate the drive time for the distance, I'll note that (short of the unexpected WTF re-trip) it would have been less than 10 hours; I-75 speed limit is 75 in most of the UP, and the other main corridor roads have a speed limit of 65, because it is so sparsely populated.

For better or worse, the Upper Peninsula is this thing that your typical car-owning family who lives in the state can actually do an inexpensive but beautiful trip around.

It's a region that is only about 42,500 Square Kilometers but only has a population of about 300K. Thus the infrastructure gaps.

On the plus side, that means it's still a pretty drive at least. :)