Still it will run for almost eternity (due to the absence of the power itself, and power was one of the reasons why ion engines works together with propellant but power got removed to equation so Ions are OP rn) until the propellant tank runs out.
Even if you add colourin and panels, they're just aesthetics. We are on performance, and performance can't be fooled.
You mean when stretching? Sure, but it will still drain 5 times more slowly than a Hawk or Titan even if you stretched it out madly until it has Hawk or Titan thrust.