Lollapalooza typically lasts for four full days, running from Thursday through Sunday. Each day, the festival usually opens in the late morning (around 11:00 AM or noon) and ends in the evening around 10:00 PM. The music performances on stages generally run within this timeframe each day. This four-day structure has been consistent in recent years and is the norm for the festival held in Chicago's Grant Park. Individual artist sets vary, but headliners often perform for about 90 minutes, with other acts having shorter sets ranging from 30 to 60 minutes.