Longest single at number one in US chart?

The longest-running single at number one on the US Billboard Hot 100 chart is "Blinding Lights" by The Weeknd. It spent a total of 90 weeks on the chart, including 10 weeks at the number one position. Released in November 2019, the song became a cultural phenomenon, topping various charts worldwide and receiving numerous accolades. Its enduring popularity has solidified its status in music history.