[Cpoll]

I wonder if LOC changed isn't often reversely proportional to time taken.

500 LOC feature: Add a new route that does something boring; 5 story points.

5 LOC feature: Fix mysterious performance degradation in X; 13 story points.

[cpascal]

I think for defect estimation you are right, but for feature estimation (new code, not fixing bad code) the correlation is positive.