It must be one hell of a luxury to be able to make a decision like this one.
One of the recent polls here suggests something like two thirds of us are working on startups either full-time or part-time. Startups don't generally allow for taking a month off (a month is often enough time for the competition to catch up if you stop working).
Although I prefer just taking a few days off the computer at a time myself. Like a weekend, or not hacking anything in the evenings for a week or so. For me, the problem isn't being online per se but the balance of being online AND offline.
When I'm offline, it will eventually energize me to get back online for a while. And when I'm online, it will do SO good to cut off the lines for a few days when I find myself only being online.
Bastard.