Mt. Everest is 8800 m high, uming its erosion is 2 mm/ year, but no uplift, how long 4 the mountain 2 erode?

Mt. Everest is 8800 m high, uming its erosion is 2 mm/ year, but no uplift, how long 4 the mountain 2 erode? This isn't a homework question, just studying & would like it explained to me. thanks