Enough Perl knowledge to convince a prospective employer that you "know Perl" sufficiently to hire you, and then know how to learn and use sites like PerlMonks to be able to figure out any problem that is thrown at you. :-)
edit: fixed an obvious English error and slightly reworded so it fits better as an answer to the original question.
Just another Perl hooker - My clients appreciate that I keep my code clean but my comments dirty.
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