I done London to Buzau Romania in about 37 hours, that included ferry, petrol stops, food/toilette stops, resting/sleeping stops. Left Saturday morning at 4Am ended up there Sunday at 7Pm. That’s 2000 miles. The worst part was Hungary and Romania, no motorways, only national roads, pain in ass, took 2 hours to get past 30 miles of very very bad stretch of road… having no motorways meant having to pass through all major cities on way, some have ring roads some don’t… took 24 hours to get through them all that’s 500 miles in 24 hours of **** roads.