I dont catch the drift... why would you need constant propulsion for 2.6 years? Propel to get to speed, do a 180 and propel to stop. ...and where are they going to put 2.6 years worth of fuel no matter how efficient the thrusters are?
It’s all a matrer of force=mass x accelleration. Lithium is heavier/denser than, say, hydrogen, and if it is being ejected at much higher speeds than a chemical rocket so you don’t need as much of it.
23,000 hours worth of Burn?? you cant convince me this system is THAT efficient.
If you cant answer my question, say nothing.