How long does the red tracer composition burn in the 40 mm AAA target practice tracer (M91) round?

The red tracer composition in the 40 mm AAA target practice tracer (M91) round is designed to burn for approximately 12 seconds. This specific duration is important for the round's intended purpose, as it allows the user to observe the flight path and impact of the projectile clearly during training exercises. The 12-second burn time ensures the tracer remains visible while providing enough time for tracking and adjustments. This feature is crucial for effective training scenarios, facilitating better marksmanship and situational awareness.