How long will a foot print last on the moon?
We can't be absolutely sure how long a footprint will last on
the moon since it might or might not be struck by a meteoroid or
other cosmic debris, but potentially it could last for billions of
years. It is also possible (although I am not expecting it) that
the moon will someday be colonized by people, who will then disturb
the existing footprints. But then again, they might want to
preserve them as monuments.