If you've been on it for over 6 months than 0.5mg every 2 weeks once you have reached to 2mg. That would be a 2-month taper. You don't want to spend too much time tapering, the idea is too get off with as little symptoms as possible comfortably.
From someone speaking who was on it for nearly 1.5 years, you'll find that the withdrawals don't really appear until you go from 1mg to zero and the symptoms aren't too bad. Nothing near the severity of heroin or oxycodone. From all the opiates I've had to withdrawal from, which includes Heroin, Oxycodone and Methadone, in comparison I'd say the withdrawals are mild to moderate.