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No. There are 24 hours in a day.

On Earth, that is pretty standard, but there could be other planets with a 50 hour day. Here are the approximate day lengths (defining a day by the time it takes a planet to rotate once on its axis) for the rest of the planets in the Solar System:

Mercury: 58 Earth days

Venus: 243 Earth days

Mars: 25 hours

Jupiter: 10 hours

Saturn: 11 hours

Uranus: 17 hours

Neptune: 16 hours

Unfortunately nothing in our own Solar System comes close, but we are always finding new planets and we might find one that has a 50 hour day someday.

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7y ago

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