We normally take 7-10 days on a trip, this year Mugello was a 3500km round trip but we went through the Black Forest on the famous B500 (do a search for the videos) and over the Alps etc. On previous trips we have visited the Ducati and Moto Guzzi factories.
I'm fortunate though that I can get to 3 airports in under 1 hour all of which have cheap flights to Europe. Barcelona is only a 2-hour flight and 1/2 hour on the train to the circuit so sometimes we do a fly away, instead of or as well as a ride.