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Straight up I'll admit to being probably wrong, so let me know if I am, but, I seem to recall the famous Antarctic meteorite which was ejected from Mars after a collision with whatever it was that collided with Mars to cause said ejection. This meteorite supposedly showed evidence of life on Mars, I'm sure you all know the one I'm referring to. It was apparently estimated that it took some million/s of years from being ejected from Mars to landing in Antarctica. Given the same time span for ejecta from the possible up-coming comet/Mars collision, that out not to be a problem for us.
Or could this be a case of KE on impact being far greater than the impact that led to the meteorite landing in Antarctica, and thus a greatly shortened time span from Mars to Earth.
Stuart
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