My productivity doesn't come from writing software. It comes from reading its code and maintaining it. You can pry my types out of my cold dead hands. :-) How

My productivity doesn't come from writing software. It comes from reading its code and maintaining it. You can pry my types out of my cold dead hands. :-) How long it takes you to do this largely depends on how much you can leverage your language's ecosystem. If you don't have a robust and fast CSV parser already written for you, then you'd need to sink many weekends into that alone.