Steven Den Beste Strawman

since ion drives output velocities are about the same) Even lunar escape velocity is only 2.4 km/sec. 150 million km
would be made in about 58 days (if my calculation is correct) but you
would have to stop this mass with this incredible speed and inertia. That's the beauty of exploiting one of the two stable axes of the L-2 point; there's no need to counter the inertia of the incoming payloads.