Not planned as such, but I made a long non-stop road trip recently in
my CLX. When I reached home I found that I had driven 410 miles in
about 7 hours. The MB comfort had made it an easy task.
Later I realised that it must be the longest continuous drive I have
ever made. No fuel stops, no comfort stops. I had some sandwiches and
some drinking water onboard to keep me going.
However, I'm sure that others can beat this.