I used to go 6 weeks or more with my accuvue's, but I went to a Doctor that explained to me the reasoning behind needing to change them and what can, and will eventually happen if you wear them beyond the recommended time.
Long story short, you'll get an abrasion or infection on your cornea which is a very painful injury that you just have to wait out. Not a whole lot to do. That left me with two choices:
Either continue to buy accuvue except buy them more often and follow the recommended schedule. Or, go get Lasik and forget about it. No, he wasn't the one doing the surgery, but I opted to get Lasik and I'm very, very satisfied and happy with the results.