i still think the 30 days is fine...
don't forget that on the flip side of things... the sponsor...does alot of work normally as well, getting SE listings, blogs, social networking, ect...where they link directly into themselves, and as such they may well be responsable for that signup from the guy who wasn't quite convinced a couple months before to sign up from your site...to now be sure he wants to sign up with the new info...and no new cookie since he came in directly...
so yea 30 days is a lifetime for the surfer, none of them remember what they saw a month before on some free site or gallery anyway...
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