Final answer:
The MBU-12P oxygen mask hose is typically 18 to 30 inches long, but the exact length can vary. For specific measurements, one should refer to the technical manual or contact the manufacturer.
Step-by-step explanation:
The length of the MBU-12P oxygen mask hose can vary depending on the configuration and requirements of the specific aircraft or user setup. Typically, the hose for an MBU-12P oxygen mask, used by pilots in military aircraft, will be long enough to allow for full head movement without restriction.
This means that the hose is usually designed to be about 18 to 30 inches long, although exact lengths can differ. If a precise measurement is needed for a specific application or replacement parts, referring to the technical manual or contacting the manufacturer would be the best steps to take to get accurate information.