Your tolerance will never return to “baseline” if you were on a daily dose of 200 mg a day for a long period chances are you will still always need that dose for relief or more.
This is true except for the first few days, for example if you were a year sober maybe 30-60 mg of oxy would work but very soon you would be back to your old levels.
please take my experience with a grain of salt and always start small and slow for overdose and harm reduction purposes.. but in my experience tolerance to opiates is semi permanent