I said about two months, but this is based on when I would get bored occasionally and want to go back to not being always lucid, not when I would be bored constantly. I doubt I would ever be constantly bored if I was always lucid. However, I do have some pretty cool nonlucid dreams, and I would miss that and want to go back to having the possibility of being other people or other versions of myself after only a month or two.