Freecodecamp.org/learn what do the mean with 300 hours?

Freecodecamp.org/learn what do the mean with 300 hours?
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Hi new here, was wondering what the 300 hours at freecodecamp.org/learn mean then i remembered that they have a forum so could somebody plz tell me what they mean with that?

That is a very rough estimate of how long it will take to complete that section.