It's pretty common in the far north as well apparently, with some people claiming people are willing to drive for several hours just for a party.
In the central east, people generally aren't willing to spend all day in a car. A couple of hours drive is acceptable, but once you're at ~5 hours we generally expect to spend the night there. And to not leave at 0600 in the morning:)
As a bonus, some of those mountain passes can be a bit finicky, so they're often good to … not plan very optimistically.
Depends on culture and level of education. For someone who comes from a culture where we use decimals, I'd interpret this in the math/physics class way, i.e. 10.