[maxwell86]

I did a similar trip earlier in January. 1100 km from Germany to the alps (550km per way).

I had to stop once for the full 1100km trip to refuel (before leaving Austria on the way back cause it’s cheap to tank there, not because we actually needed to refuel).

It was ~4:30 per way. Nobody in the car had to pee, etc.

I think doing 15 min break per way would have been ok. But doing 1h per way or more if breaks is really not great. Particularly with kids in the car (we leave really early put them as sleep, they woke up for the last 2:30 h or so and that was borderline).