The odachi is a type of Japanese sword characterized by its exceptionally long blade. While there is no standard length for an odachi, they are generally considered to have a blade length of around 35 to 60 inches (89 to 152 centimeters) or even longer.

The length of the odachi blade makes it significantly longer than the average katana or other Japanese swords. It is important to note that the odachi was primarily used in ceremonial or battlefield settings and was known for its impressive reach and cutting power.

Due to its extended length, the odachi was typically wielded with both hands. It often required significant skill and strength to handle effectively. The design and purpose of the odachi were distinct from other Japanese swords, serving as a symbol of status, military power, or ceremonial importance.

It's worth mentioning that the odachi is a historical sword and is not commonly seen in contemporary swordsmithing or martial arts practices. Modern reproductions or interpretations of the odachi may vary in terms of dimensions and design.

In summary, the odachi is characterized by its long blade, generally ranging from 35 to 60 inches (89 to 152 centimeters) or longer. Its impressive length and cutting power made it a symbol of status and a formidable weapon on the battlefield. However, it's important to note that the odachi is a historical sword and not commonly seen in modern contexts.