My mistake, I didn't see what user posted; ofcourse you already know that.
Maybe a good way to actually measure would be using someone's source control, graph the dates and lines of code (relative to the final project's size) for each code submission. Even that would be a fairly inaccurate though.
I don't know how much I write on a daily basis - it varies too much on what I'm working on, as well as whether the parts I'm working on require longer build times by altering headers that effect more of the overall project, or whether the entire week is spent debugging various parts of the code without only a few lines of code getting written.
If I'm working on a bunch of helper functions or the shell of a new class I can easily reach >200 lines of code an hour, but if I'm working on finer implementation details that I need to keep debugging or really think through, it might be 20-30 lines of code an hour in between hours of no code being written. I don't have exact measurements to give, however. I've never recorded it or thought to do so.