During a 24-hour period, you can be exposed to a Nitrox mixture at its Maximum Operating Depth (MOD) for up to:

The correct response indicates that divers can safely be exposed to a Nitrox mixture at its Maximum Operating Depth (MOD) for a maximum of 150 minutes within a 24-hour period. This time limit is essential for ensuring that divers do not exceed the safe exposure limits to oxygen at increased pressures, taking into account the effects of nitrogen as well.

When diving with Nitrox, which has a higher oxygen content than air, managing exposure to oxygen is critical to avoid toxicity. The MOD represents the deepest depth where the partial pressure of oxygen remains within safe limits. The duration allowed at this MOD is a balancing act between maximizing dive time while minimizing the risk of oxygen toxicity.

This specific duration of 150 minutes is established based on the research and guidelines set by diving safety organizations. It provides a broader allowance for divers who may need to make adjustments to their dive plans while still adhering to safety protocols. By following these guidelines, divers can increase their safety and enjoy their dives without the serious risks associated with exceeding exposure limits.