i did it, 1200+1200 km. Everything went great except i accidentally entered Moscow at midnight: I wanted to go around moscow by mkad but missed my turn, then i was trying to turn back but there were no turns to left at all. So i rode all along warsaw highway untill i reached inner circle and there i lost completly, tried to find new way out untill i turned wrong way two more times and found myself on warsaw highway again but driving out of that damned city. MKAD was also scary as fuck, despite the time (past midnight) it was filled with cars driving 90-120 kmh, shit is scary as fuck.
>why dont you use navigation app?
because im smarter than everyone else obviously
aside from this story everything went smoothly. Havent paid a kopeika to road jews and drove all the way by free (90(+20)kmh speed limit) roads.