In 2005, it took 45 hours for an unprotected e-mail address to pick up spam. In 2007, it takes 123 hours. An address I published on 6 August at 11:00 picked up its first spam on 11 August at 13:55.
Maybe I’m not comparing like with like, as the name I used in 2005 (Olaf) is a real name. This year’s test used “aelmkizk”, which is unlikely to be a proper name. Maybe my site’s less popular.