By plane: max. 3 hours By car: Paris-Bucharest 2 290 km (theoretically 26 hours at 90 km/h, but practically 3 days)
Miami, FL (MIA) to Paris (PAR) Shortest Flight Duration 8 hours 30 mins
4 hours by ferry 5 hours by car
It's an around 8 hours flight.
about 15 hours