This is hard to predict, but IME, after coming off an 200mg/day oxy habit, I'd take .25-.5 mg of bupe for a day or two and be withdrawal free. However, you took WAAY more bupe than needed, so there's a chance you could feel WD's.. Here's my advice, wait 2-3 days for the bupe to leave your system, switch back to the short acting oxy for a week or two, then switch back to the bupe, but this time, take .25-.5 mgs a day, for 3 days. Try skipping a day if you can, or at the very least, try holding out as long as possible before re-dosing the bupe. After the few days you should be in the clear as far as bad acute WD's go.. you may feel sluggish and you'll definitely have the "mind fucks", but the physical issues should be limited.