I think that the lesson here is that it is kind of silly to try and put a time estimate on these things. How do you define time spent "writing"? Does it include time spent researching? Time spent thinking of the structure? If you pause to formulate the next sentence or line of code, should you stop the clock? Maybe we should only measure time taken in each individual key press.

It makes much more sense, and is less ambiguous, to talk about "time to complete a project". Like a book, for example.