It really depends on the place. When I was in detox, I was there for 6 days. No computers, but then, there really was no time anyway. The days are spent in classes and meetings. No cell phones were allowed, but there were phones where you could make calls between classes and such. Don't worry about being cut off from the world. It's only for a few days and you'll be busy anyway. Just go with it and pay attention. Let them help you.