I've never counted. But I'd guess not more than 300 or 400, and by the end of the week, if I've been thinking clearly, I'll have shaved the code written down to less than that. Probably my most productive week ever ended with ripping almost all of my code out, and replacing it with an SQLite module from CPAN. The program went from a few thousand lines to about 500, making the software O(1), instead of O(n^2) or something worse.