Denali, North America's highest peak (20,310 ft / 6,190 m), is still often called Mount McKinley. A standard expedition on the West Buttress route takes:
Key factors: extreme cold, high altitude (low oxygen), heavy loads (sleds + backpacks), and unpredictable storms. Climbers typically carry 50–70 lb packs and pull 40–60 lb sleds, moving caches up the glacier in a "carry high, sleep low" strategy. Success rates average 50–60%.