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The Science of Takeoff: Why High-Altitude Airports Require Exceptionally Long Runways

Airport runway lengths vary significantly across the globe, a difference primarily dictated by aircraft performance and environmental factors. The key variables are airport elevation and ambient temperature, which together determine air density. At higher altitudes or in hotter climates, the air is thinner, providing less lift for an aircraft's wings. Consequently, planes require a much longer ground roll to achieve the necessary speed for a safe takeoff. This is why hubs like Denver (DEN) and Johannesburg (JNB), known for their 'hot and high' conditions, feature some of the longest runways in the world.

Official Source: https://simpleflying.com/airport-runways-longer-most-major-hubs-pilots-reach-eye/