I've got a basic code line counter that I like to run on my projects occasionally.  Just hit the SDF source tre and this is what I got:

code lines=51090 comment lines=32619 files=473 projects=12

A typical rate of development for an experienced developer is probably 100 lines of debugged code per man-week.  That means that the SDF has roughly 9.8 man-years of development invested.  Now consider you can get it for free, including source.  Even if you were superhuman and could write 1000 lines of code per week, it would still take you a year to replicate it.