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As it is commonly known it would take about 3-4 days. Orbital velocity is 17,000 miles per hour. To leave earth's orbit we must accelerate up around 24,000 miles per hour. Since the distance to the moon is 240,000 miles, the ratio of these figures yields an answer of about 10 hours. It also takes time to speed up, and to slow down for insertion into lunar orbit, which explains the actual trip time of about 3 days.

If you didn't care about slowing down to safely land on the moon, you could cover the distance in less time by connecting to a big engine already in orbit and then accelerating all the way until you impacted the lunar surface. You could make a pretty impressive crater--the flash should be visible from earth (through a telescope) if you could hit the lunar night side at quarter moon.

Laser light from earth strikes the lunar surface after a journey of about 1.3 seconds.
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Q: How long does it take to reach the moon?
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