I would've said considerably more to be honest. 100 hours including getting the basics perhaps.
But it's sooo long ago that I did stuff like unlocking that I really can't say.
I would also recommend not to start in an FdL because that one is very special to fly, and expensive if you die.
And you will die.
I think that's over-cooked. With the right knowledge, 2-3hrs per engineer is almost a leisurely pace - you can combine some of the tasks while playing. So, depending on different peoples idea of a PvP FDL. Felicity, Tod, the Dweller, Selene, Didi, and Cheung gets you access to: https://s.orbis.zone/5bce
G1 Power Plant
G3 Thrusters
G5 Shield & Shield Boosters
G5 Hull & Hull Reinforcements
G5 Power Distributor
G5 Multicannons & Rail Guns
G4 Pulse Lasers
Really, after that you're only adding G5 Thrusters, and more weapon choices.