How long does Firewatch have to stay after hot work?

Can you please elaborate on the requirements for Firewatch after hot work? Specifically, how long is the recommended duration for a Firewatch to remain on site following the completion of hot work activities? Are there any industry standards or regulations that dictate this time frame? Additionally, are there any factors that may influence the length of time a Firewatch needs to stay, such as the type of hot work performed, the materials involved, or the specific hazards present in the work area? Understanding these details is crucial for ensuring the safety of workers and preventing potential accidents.