Yesterday, at the SQM lecture about Lines of Code (LoC) metric, we were discussing how much time it takes to create a large software product. Felix at Quora says that it is somewhere around 250 years for a million LoC. I've just counted my numbers for the last 10 years, in 195 repositories. I'm pretty close to a million, but not yet there :) On average, it's 6K per month.