I was prescribed oxycodone hcl short term for severe pain from a herniated disc. approx how many hours after the last dose of a short acting opioid can i expect to be clear of getting withdrawal symptoms? thank you?

Withdrawal symptoms will depend on many factors-like how long you took the oxycodone for, how high a dose did you take each time, how regularly did you take it, etc? If you took a small dose for only a few days and you did not take it regularly or often each day, you would be unlikely to develop any withdrawal symptoms. You should talk to the doctor who prescribed it to determine your risk.