When you start, you will more than likely be on blind lines most of the time. On the 777 this will pretty much mean you get MBTR (Min base turn around) between trips, which is 2 days for most trips. On the 747 you will get a minimum 2 days off, but because the trips are a bit longer, you can normally get three days off between trips, and sometimes 4, 5 or even 6 days.
You also need to remember that some of your trips will be late reports and early arrivals. Inbetween such trips, it would be easy to commute within Europe, even if you only had two days off.