This answer will freak you out, I was diagnosed over 20 years ago and they did things different then....they would NEVER do this now.....I was put on prednisone for just shy of 3 years @ 65 ml per day, every time my GI looks in my records he still says what the hell was he thinking..!
Don't remember the exact amount of time but it was over a year and over 50mg up to 75mg (kept upping the dose). Only lasting side effect was stretchmarks.