It generally takes about 3-5 days of consecutively using before you'll experience a withdrawal.
When I first did opioids as a teenager, I would use them only for a day once in awhile. And honestly they're an acquired taste & I think it would take multiple times of using before somebody really started to enjoy them. Cause most people are just gonna feel sedated & maybe even nauseous if they're not really use to it.
Everyone's different though as far as their chances of getting addicted/dependent. Some people might not get any withdrawals if they're not a habitual user & it's just a one off time. Some one might try it once & decide they wanna keep doing it. So no one can really say when or how you'll get addicted.
If you're fine with 3 percocet a month, then I wouldn't say you're addicted. But if you decide you need more than 3 a month or suddenly start craving it all the time, then yeah you'll get addicted.
Highly unlikely that you'll get dependent from using 3 percocet a month though.
You would have to use all day, everyday, for at least 3-5 days in a row before you'd get a withdrawal.