Zenitsu Agatsuma, a character from the anime and manga series "Demon Slayer: Kimetsu no Yaiba," wields a sword known as "Nichirin Blade" like other demon slayers. The exact length of Zenitsu's sword is not specified in the series. However, like other standard Nichirin Blades used by demon slayers, it is typically depicted as a katana-style sword with a blade length ranging from approximately 60 to 70 centimeters (23.6 to 27.6 inches). The length of the sword can vary depending on the specific design and artistic interpretation of the character.