Yes, but a decent amount of software is doing things that are relatively unique to the time, place, and organization creating it. For those sorts of projects,

Yes, but a decent amount of software is doing things that are relatively unique to the time, place, and organization creating it. For those sorts of projects, you might as well use this equation for time to completion: sum of(number of lines in the spec/request * d4)*3 = days to complete.