Altitude primarily affects the boiling point of water, which can slightly increase cooking times for sous vide eggs. Water volume has a negligible effect on cooking times as long as the water bath maintains a consistent temperature.
Sous vide cooking relies on precise temperature control. Altitude affects the boiling point of water; at higher altitudes, water boils at a lower temperature. While the sous vide machine maintains the target temperature regardless of the boiling point, the slightly lower boiling point at high altitudes *can* marginally increase the time it takes for the egg to reach the desired internal temperature. This is because the temperature differential between the water bath and the initial egg temperature is slightly smaller. However, this difference is usually minimal and often doesn't require significant adjustments to cooking times, especially for eggs.Water volume, on the other hand, has a very minimal impact on sous vide egg cooking times, *provided* your sous vide machine is powerful enough to maintain a consistent temperature. A larger volume of water will take longer to initially heat up, but once the target temperature is reached and maintained, the cooking time for the egg will be virtually the same as with a smaller volume. The key is ensuring the water bath remains at the precise temperature throughout the cooking process. If the water volume is so large that your sous vide machine struggles to maintain the temperature when the eggs are added, then you might see a slight increase in cooking time.
Always preheat your water bath to the target temperature *before* adding the eggs. This ensures consistent cooking and accurate timing, regardless of altitude or water volume. If you are at a very high altitude (above 5000 feet), consider adding an extra minute or two to your cooking time as a precaution.