Revolt of Inaros (Egypt) (apr 1, 474 BC – jan 1, 469 BC)
Description:
 Egyptian revolt against the Persians and the revolt lasted 6 years, according to Thucydides (The Peloponnesian War I:104,109-110) 
Added to timeline:
Date:
apr 1, 474 BC
jan 1, 469 BC
 ~ 5 years and 2 months