What is the minimum time required from the last engine start to brake release for take-off?

The minimum time required from the last engine start to brake release for take-off in the Dassault Falcon 7X is indeed four minutes. This timeframe is critical for ensuring that the engines reach the necessary operating temperatures and pressures for a safe take-off.

During this time, the aircraft systems stabilize and the engines perform essential checks that help to ensure optimal performance and reliability. Starting engines generates significant heat, and it is important that the engines, as well as the associated systems, reach a condition that is conducive to flight operations. Additionally, this waiting period allows for any irregularities to be addressed and gives the crew sufficient time to conduct pre-flight checks.

This requirement is designed to enhance safety and operational effectiveness, ensuring that everything is functioning as expected prior to take-off. While the other choices may seem plausible, they do not align with the operational protocols established for the Falcon 7X, thus underscoring the importance of adhering to this specific four-minute rule.