Not much, just about as long as I am at work :) And of course, a few hours on the weekends (well, I do need to spend those daily XP points somehow, and maybe get a few more <grin>...)

Honestly, I usually do have other languages to tend to; however, I am in the Perl phase for a while, so besides reading the books, FAQs etc, I also absorb the spirit of Perl and PM is an excellent place to do that.