How long did it take to make the assent to an from the mariana trench?

The descent to the Mariana Trench, specifically to its deepest point known as Challenger Deep, typically takes about 1-2 hours, depending on the submersible used. The ascent back to the surface usually takes a similar amount of time. Overall, the entire mission, including both descent and ascent, can take roughly 3-4 hours. However, preparation and other operational aspects may extend the total duration of the expedition.