The numbers I gave are not exact. Depending on details that I don't think anyone entirely knows. Sometime 1 person is too many (generally implying a bad programmer), while other times you can get a bit over 10 if you have strong discipline. Likewise strong discipline can get you to 100k lines. Really what this is about is how much pain you are willing to put up with. 10 people and 10k lines of code are good round numbers to work with.