If you mean a complete east-west traverse from Vienna to Nice (Nizza), that has been already done quite often.
If you do it in summer, starting around mid April or begin of May in Vienna, you don't need Ski's or Snow shoes, only crampons and ice axe.
Depending on your route and on the summits you want to climb, and if you want to run or enjoy it will take 3 to 6 months.
I know from routes from Vienna to the far south and along the dolomites to the west, and other routes along the alpine main crest, more in the north.
An action like that is my dream after retirement.