NASCAR Cup Series points race held at the Charlotte Motor Speedway in Concord, North Carolina, on the fourth or last Sunday of May and during Memorial Day weekend. It is the longest race on NASCAR's schedule. It is unique for having track conditions that change throughout the race due to the race having a day to night transition, (if the race occurs on schedule with no delays or postponements). The race starts around 6 p.m. when the track is bathed in sunlight for about the first third of the race. Roughly the second third happens at dusk, and about the final third of the race occurs at night under the lights. - Source: Wikipedia
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