6 months clean, first time really trying so no real relapses (I say real because I've taken a week off here and there but never really tried to quit). 1 white chip, and no relapses yet, my main motivation is the obvious, drugs/alcohol suck. I saw with a quickness what was happening to me and though I didn't hit bottom, I saw it flying up to me (I equate it with jumping out of a plane and seeing the ground coming up and making a decision to pull the chute or not).
I think I stay clean just to spite myself, I've got a relatively large ego and once I put my mind to something I (like a lot of addicts) over obsess over it.