in reply to
How many man-hours would you estimate you have invested in learning Perl?
Hundreds, nay thousands. First started learning Perl some 15 years ago and I'm still discovering and figuring new things out. As an example, it's only been a few days since the first time I ever solved a complicated problem using a oneliner combining split(), map() and join() without peeking at the docs or someone elses code.
I don't really see it as an investment though, because learning Perl isn't something I do in order to achieve some goal. I see it more as practicing a form of art that only other geeks can truly appreciate.
Do it by numbers, do it for a living, do it to get better, because someone told you to, or just do it because you enjoy doing it.
Time flies when you don't know what you're doing