How long specifically should you pay a worker who is not productive at their job and is killing the business? 5 years? 10 years? 20 years? Until the business

How long specifically should you pay a worker who is not productive at their job and is killing the business? 5 years? 10 years? 20 years? Until the business dies? I don't think you really interpreted my statement fairly. Perhaps I should have chosen another word instead of aging, but I was thinking in the traditional factory sense where there is a correlation with age and performance doing manual labor. Age should not be the indicator, performance should.