12 hours for me. In my case it works even better than Darvon Compound 65, without the pesky need to get an Rx
Aleve better than Darvon 65 ? Wow, Darvon was wonderful for me years ago when I had to have a lot of dental work crammed into a short time but nowadays no one will even prescribe it. It's the very best painkiller I've ever taken.(Demerol was as good or better but I didn't like the really weird dreams that came with it so I only took it the once).
For inflammatory stuff Indomethacin(sp) works wonders but you need a prescription for it, it makes Advil look very puny !