It depends on what I'm doing without the internet. If I'm traveling and doing things, I'm fine, but if I'm just sitting around, I kind of want to use the internet. So about 2 days?
I had the internet on my phone (Blackberry) but I refuse to use internet on my phone... I don't have the patience to wait, I only use it for small stuff (MSN, checking e-mails/emailing, etc). But I need to have the internet on my desktop/laptop.
I used to spend my time watching tv, writing or something like 5 years ago, now if I don't have internet a week I feel like I'm dying, I mean no new music, no fb, no msn, no twitter, etc, etc, whoever that deny this, it's lying