K2 Base Camp Trek : Difficulty Level, Permits, Itinerary & Expert Tips is a high-altitude expedition in the Karakoram Range that requires strong fitness, proper permits, and guided logistics. The trek typically lasts 12–14 days on the Baltoro Glacier, reaching Concordia and the base of K2 (8,611m). With the right preparation and licensed operator, it is achievable for experienced trekkers.