There is no rule about how quickly it will happen, just like there's no rule about how quickly your tire will go flat if you get a hole. You could end up with a slow leak over a couple of weeks, or you could end up with a hole that empties it in seconds, or anywhere in between.
If you're starting to have bad sectors show up though, it's a good idea to start seriously looking at replacing it sooner rather than later, unless you simply don't care about anything that's on the drive.
"How do I get rid of a Trojan Horse?" -Sailor_Kakashi "Leave it outside the gates of Troy overnight." -Davel23
I got a HDD drive that everything says its in poor health. I mentioned it here once and everyone said It will die soon. Its been a few months later now and its still kicking. So....
when your PC decides to not boot one day, you'll come crawling here for help. we'll all point, laugh, and tell you that you should have replaced it when it was still under warranty. i'm even going to tag you as such for the future so i can laugh the hardest.
London-SV on Throttle Control in Gran Turismo 6 ~ ''Unless you're flooring it at every opportunity... Try to be a little more genital on the accelerator''