A flea moves very fast and it moves like from place to place that's what I would actually say. I don't know about your answer! If I asked this what would be your answer? Nevermind I'll just tell you the answer... Fleas move very fast!
This may take some hour or minute... Asteroids that will hit a Planet in a seconds, are very rare and very fast. I don't know if there is a very fast asteroid so I answered "This may take some hour or minute"