I want to quit taking tramadol, how long do I have to wait before taking subutex?

I have been on Subutex for 3 years, because of pain pill dependency. Because of my bulging discs, I had to take tramadol for a few days for pain. But now, I want to go back to subutex.

Thanks

: http://alcoholdrugstreatment.info/i-want-to-quit-taking-tramadol-how-long-do-i-have-to-wait-before-taking-subutex