A big hit like that one? I've heard something like once every 100 million years or so.
If they do...it must be one heck of a mathematical computation to figure out the probablity...then of course there's the differences of consequences of a direct hit, a negative rotation hit or a positive rotation hit...is it in the Northern Hemisphere during which season or the Southern?
I bought a Lotto ticket today...odds 41,600,000 to one...hundreds of people have "beat the odds."