Arriving FCO from Philadelphia at 9:05 AM via American Airlines (Terminal 3, I think). Departing eleven hours later (19:55) via EasyJet (Terminal 2?) for Milan Malpensa. How early will EasyJet accept hold luggage? Is there a "left luggage" service? If yes, where? Will there be enough time to leave FCO for sightseeing in Rome? If yes, how much time should we safely budget to do so, in order to be back at FCO for departing flight. We are US citizens.