How long would it take to walk to the moon?
The Real Answer
The Moon is about 238,900 miles away from Earth. If you walked 20 miles per day (a very ambitious pace), it would take you roughly 32 years of continuous walking with no breaks, assuming a straight line was somehow possible. In reality, you'd die of oxygen deprivation in about 3 minutes once you left Earth's atmosphere, so the answer is effectively 'never.'
You're already planning the route in your head, aren't you. We've decided that the Moon is close enough to walk to, but far enough that we need a rocket. We've split the difference between ambition and physics, and the compromise is that you stay home and watch someone else do it on TV.
Why People Ask This
This is the kind of question that pops into your head when you're bored and looking up at the night sky — it feels close enough to touch, so why not? There's a weird psychological thing where the Moon seems closer than it is because we can see it. People are usually shocked to learn that you could drive across the entire United States and back multiple times before covering the Moon distance.