Metallica's 1991 self-titled album spent four consecutive weeks at number one on the Billboard 200.
The achievement followed the album's debut at the top of the U.S. chart. It was Metallica's first number-one album in the United States and established a commercial benchmark that the band would revisit with several later releases.
The four-week run is different from the album's much longer overall chart life. Metallica continued appearing on the Billboard 200 for many years, helped by sustained sales, touring, catalog interest, and later reissues. A short uninterrupted run at number one should not be confused with total weeks on the chart.
The album's success was international as well. It reached number one in ten countries, although chart positions and the length of each country's run varied. The Billboard 200 statistic specifically describes the United States album chart.