The Apollo Astronauts footprints on the moon will probably stay there for at least 100 million years
Since the moon doesn't have an atmosphere, there is no wind or water to erode or wash away the Apollo astronauts' mark on the moon. That means their footprints, roverprints and discarded materials will stay preserved on the moon for a very long time.
They won't stay on there forever, though. The moon is still a dynamic environment! It's actually being constantly bombarded with "micrometeorites" which means that erosion is still happening on the moon, just very slowly.