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Yeah, OxyContins last 8 hours, according to patients, not the advertised 12 hours.
Duragesic patches are SUPPOSED to last 100 hours, but you're right, they don't. Since it takes 18 hours for the patches to start working, at least one poster puts another patch on after 72 hours, while leaving the first one on. That way, as the first rapidly diminishes in strength, the new one is helping to cover for it.
Avinza, though - it's only 100mg morphine, and most morphine gets broken down very quickly by the body anyway, so it's really not for super-strong pain. But its time-release mechanism actually involves nanoparticles and DOES last as long as advertised. BUT... it's pretty weak.
Some docs are coming around to these facts, but it'll be years before they stop reading the pamphlets they get from the drug companies and start trusting their patients....