The classic trail to Rae Lakes from Roads End in Sequoia National Park is a 42-mile loop and can take 4 days to hike and camp comfortably. The second popular trail option to Rae Lakes from Kearsarge Pass in Eastern Sierra is 12 miles with two high-altitude mountain passes from the trailhead to Rae Lakes, and can be done in 2 days, or continue to do the full classic loop and add a few more days and a lot more miles in.