* "Je pas" is incorrect: The correct way to say "I don't" in French is "je ne".
* "Marcher" is missing a conjugation: The verb "marcher" (to walk) needs to be conjugated correctly.
* "Pendant des heures" is correct: This means "for hours".
A corrected and meaningful version of the phrase would be:
* "Je ne marche pas pendant des heures." (I don't walk for hours.)
Let me know if you have any other French phrases you'd like help with!