Your tolerance level cannot really be "figured" out per se. The safest correlation to make is by lookin at the maximum dose you have taken or since you seem not to have abused then your average daily use and that's your level. I , for one, was up to 250mg a day of oxynorm just 11 days ago so I would imagine someone in my position going through a harder wd than say 30mg per day. But there is NO cut an dry scale to weigh it on. A question you could ask yourself is do you ever take the oxy and not feel better? How much is not enough?
Do you no longer need the pills for pain?