It depends on a lot of things... oxycodone pills come in different strengths, one pill can be between 5 and 80 milligrams of oxycodone. Some are time released, some are instant release. And some have Tylenol (acetaminophen) in combination.
It also depends on how old you are, how heavy you are, what your opioid tolerance is like, if you combine it with other drugs, etc.
well it's too late now if you did! as sekio said, what's the strength of the tablet? for first time users 10-15mg is enough. please never do this again without checking the strength of the tablets. if they're 80mg tablets and you chewed the pill you ate then i'd seriously seek medical advice!