Oh, I think I just realized how to solve this geometry problem without breaking the space-time continuum!
The cabin could be 6 hours
drive away because the road there goes around something, some geographical obstruction that cars are unable to cross - mountains, a wide river or a river in a deep canyon somewhere up the mountains and the road goes around these obstacles, creating a wide loop of 6 hours drive there.
But at the same time the lake and maybe even the cabin are in a small hike distance on foot. A shortcut. Maybe there's a small suspension bridge across the canyon or you have to climb up or down a slope too steep for cars
. Maybe the cabin is also further away than the lake.
With the ground around here having much less lumps and bumps than Beanpole's body does, I failed to realize until now that such obstacles may exist in some places. I've only been in real mountains a few times, so I'm not used to think in 3D when it comes to geography and travel distances.
Of course, it may be a bit unrealistic that no shortcuts in the form of tunnels or bridges have ever created to reach these places, but they may be in a scarcely or completely unpopulated area. Maybe a nature reserve of some sorts.
Obviously, I haven't really thought about it before, so it could still create some inconsistencies...