I've done a thousand "real" lines in a day, but it was like a 10 hour "day," and it was just coding for the entire period. No emails, no meetings, no peer reviews, no debugging. No design or architecture work--that was all done on a previous day.

And obviously all of that code did get tested and debugged and reviewed, but on a different day. So I can't really say that those lines were "completed" in one day.