Answer based on context:

New wave music experienced a lot of mainstream success during the late 1970s and also during the 1980s. During the late 1970s and early 1980s, Blondie had 4 songs on at number 1 on the Billboard Hot 100. The Clashs song "Rock the Casbah" went to number 8 on the Billboard Hot 100 on 22 January 1983. The Clashs album Combat Rock was certified platinum by the Recording Industry Association of America (RIAA) on 10 January 1983 was later certified 2x platinum by the RIAA in 1995. Men at Works albums Business as Usual (Men at Work album) and Cargo (album) were certified 4x platinum by the RIAA on 19 October 1984 and 2x platinum by the RIAA on 19 October 1984, respectively. Men at Works song "Who Can It Be Now?" peaked at number 1 on the Billboard Hot 100 in 1982 and the bands song "Down Under (song)" peaked at number 1 on the Billboard Hot 100 in 1983. In 1983, Men at Works songs "Overkill (Men at Work song)" and "Its a Mistake" peaked at number 3 and number 6 on the Billboard Hot 100, respectively. Men at Works album Business as Usual peaked at number 1 on the Billboard 200 on 13 November 1982 and was at number 1 on the chart from 13 November 1982 – 19 February 1983.

How many months was Business as Usual at the top of the Billboard chart?
3