t for the first 2 hours or so. oxy contin is roughly .05 times stronger than oxycodone . but. roxicodone is an instant release meaning the full 30mg hits you at the same time. a 30 mg o.p. is an extended release and is equal roughly to 35 miligrams of oxycodone and has a noticeable life of about 10 hours. roxi however fades quickly after 6 hours