Is there a pain medication (similar to oxycontin) that lasts for more than 6 hours?

A family member is taking oxycontin every 4-6 hours & wants to take something that will last longer so he can take fewer pills.

: http://alcoholdrugstreatment.info/is-there-a-pain-medication-similar-to-oxycontin-that-lasts-for-more-than-6-hours