I just deleted 2,200+ (I had 22,000 so that's 10%) links on smiling pussy links. Did a linkbot scan after more than a year, turns out a few of the guys that have been submitting to me for years just quit the biz and let there domains expire.
Also deleted 200 or so category linktrades of sites that just didn't excist anymore...
But other than that links should stay up for life...
note to self: run the bot more often