Rode from somewhere in northern Italy to Nice, France. It was september, roads were very quiet, weather was mostly good (almost froze my hands right off on a rainy descent, but the rest was quite good). Slept in hotels as I only had four days and was doing like 2500-3000m elevation every day.
I would thouroughly recommend crossing the alps on a bike. I don’t know if credit card bikepacking is frowned upon on this forum, but it can be an amazing experience. 
I was in better shape back then. And even so I sent myself a postcard from the route forbidding myself from planning a route that hard ever again
Haha thats actually hilarious. Ive got a tour planned through the scottish highlands next year I might have to do the same 😂