For some it’s quicker than others:

• Huffpo: Why I Hate Interviewing Famous Women
• Top 100 Pops Songs of 2004
• Olympic gymnast celebrity short lived
• Leading Men Age but their love interests don’t
• Length of artist career in music industry

Data from more than 50 years of Billboard music charts was used in the first phase of the study.

It showed that artists maintain their presence on the album charts for anywhere from 3.95-6.16 years, depending on various chart criteria. Thirty-four percent of artists who debut on the album charts only hit the charts once. On the pop singles chart that figure rises to nearly fifty percent.  Link