Apparently, my first statistics were way off. It's taking almost exactly 5hrs30min on the last test.

I'm going to chalk it up to a learned lesson and unreserve all my uncompleted, since I don't even have 512MB of memory(more like 484MB total). Obviously, I have room for an upgrade, but not until I get another job.

Thanks for the heads-up, vjs. Factoring is more beneficial when compared to prping, but sieving, from a statistical standpoint, is probably precisely where I need to be.