Final answer:
The example provided relates to calculating nozzle pressure in a fire hose, and it does not specify the duration for pressure maintenance during hose testing. This information is typically found in relevant firefighting equipment standards or manufacturer guidelines.
Step-by-step explanation:
The question is asking about the duration for which pressure is maintained during hose testing. This is typically a procedure followed to ensure the integrity of the hose, often in firefighting equipment. However, the provided example focuses on calculating pressure at a fire hose nozzle and doesn't directly provide the duration for which pressure is maintained during testing. Generally, standards for hose testing will specify the duration, which may vary by jurisdiction or according to the manufacturer's recommendations. For instance, NFPA 1962, Standard for the Care, Use, Inspection, Service Testing, and Replacement of Fire Hose, Couplings, Nozzles, and Fire Hose Appliances suggests a typical duration that fire hoses should be tested under pressure, but this period should be looked up in the applicable standards or guidelines.