[jkzekdxo] Falling into the Sun

Powerful aliens arrive demanding subservience from us puny Earthlings, or else they threaten to destroy Earth. To demonstrate that their threat is credible, they crash Mars into the Sun, first stopping the planet dead in its tracks in its orbit, then letting the Sun's gravity do the rest, as we observers on Earth watch helplessly. How long will Mars's fall into the Sun take? Perhaps the aliens arrange it to pass by near Earth, though they'll have to correct the probably drastic shift in Earth's orbit it would cause.