How long do the emergency lights last on the CRJ 700?

The emergency lights on the CRJ 700 are designed to last for 20 minutes when activated. This duration is specifically established to ensure that in the event of an emergency, passengers and crew have sufficient illumination to evacuate the aircraft safely and effectively. The 20-minute duration is generally considered an adequate timeframe for dealing with typical evacuation scenarios, allowing for enough visibility to navigate emergencies before the lights are expected to turn off.

In the context of the other durations provided in the options, while some may seem reasonable for emergency lighting, they do not meet the established operational standard for the CRJ 700, which is set at 20 minutes. This specific engineering decision enhances safety protocols and prepares staff and passengers for the potential urgency of an evacuation.