For how long should the fire watch remain after the completion of hot work?

The correct answer is that the fire watch should remain for 30 minutes after the completion of hot work. This duration is significant because it allows for a sufficient period to ensure that any potential ignition sources that may arise from the hot work are identified and mitigated. Hot work processes, which include activities like welding, cutting, or grinding, can generate sparks and heat that could ignite combustible materials.

The 30-minute duration gives time for the area to cool down and any residual heat to dissipate, reducing the risk of fire. Additionally, fire watches during this time can monitor the environment for smoldering materials or unexpected flare-ups that might occur after the work has been completed.

It's critical to adhere to this timeframe as industry standards and safety protocols are designed to protect personnel and property from the hazards associated with hot work operations.