What is the average time to reach summit of Mt. Everest?

The time it takes to reach the summit of Mount Everest can vary depending on several factors, including the climber's experience, fitness, weather conditions, and chosen route. On average, it takes around 40 to 60 days from the time climbers arrive in Nepal or Tibet until they reach the summit and return to base camp.

Here is a general timeline of a typical Mount Everest expedition:

1. Arrival and Acclimatization: Climbers typically spend the first week or two in Nepal or Tibet acclimatizing to the high altitude. This involves gradually ascending and descending to higher elevations to allow the body to get used to the thin air.

2. Base Camp: Climbers establish base camp at around 5,364 meters (17,598 feet) on the Khumbu Icefall. This serves as the main hub for the expedition and a place for climbers to rest and prepare for the ascent.

3. Intermediate Camps: As climbers acclimatize further, they establish a series of intermediate camps at higher elevations. These camps serve as resting points and places to store supplies. The most common intermediate camps are:

- Camp I: 5,944 meters (19,501 feet)

- Camp II: 6,492 meters (21,299 feet)

- Camp III: 7,162 meters (23,500 feet)

- Camp IV: 7,925 meters (26,001 feet)

4. Summit Push: The final push to the summit typically begins from Camp IV. Climbers start their ascent in the early hours of the morning, aiming to reach the summit before nightfall. The ascent to the summit and the descent back to Camp IV usually takes around 16-18 hours.

5. Descent: After reaching the summit, climbers begin their descent, stopping at various intermediate camps along the way.

6. Return to Base Camp: Finally, climbers return to base camp, marking the end of their expedition.

It's important to note that the timeline can vary significantly based on individual climbers' pace, weather conditions, and any unforeseen circumstances that may arise. Some climbers may take longer to acclimatize or may face delays due to bad weather or altitude-related illnesses. Additionally, the time spent on the mountain can be influenced by factors such as experience, route choice, team dynamics, and the overall logistics of the expedition.