What is the largest mutiny in terms of people involved (approx.) or the number of days it lasted in the recorded history? -
Mutiny - Mutiny is a criminal conspiracy among a group of people (typically members of the military; or the crew of any ship, even if they are civilians) to openly oppose, change, or overthrow a lawful authority to which they are subject. The term is commonly used for a rebellion among members of the military against their superior officer(s), but can also occasionally refer to any type of rebellion against an authority figure.
Hence, we can exclude wars between kings/kingdom, fights between communities and war on terrorism. And whether the mutiny was a success or failure is no concern and it can be in progress as we speak.
Also, a Wikipedia page lists down some of the famous mutinies