My application takes 10 days to compile. Is there a way I can
    avoid compiling my whole application with /DEBUG?

    Yes. PCA will provide all functionality except annotated source
    listings and codepath analysis, as long as the objects contain
    traceback information because most of the DST information that
    PCA needs is there. Once you find which modules are of interest,
    you can compile those with /DEBUG, then relink the application
    and gather the data again.