I don't know how long they are supposed to last always on, but I have done a few always-on displays with cheap-ass consumer TVs. They have always been fine left on for a couple of years. I mean, some of them got turned off on weekends and stuff, but for the price of a commercial display, you can buy 4 cheap-ass displays, and just replace one if it dies. I've also seen lots of these commercial displays die as well... I just don't believe they are really worth spending the money on. Of course, this was back before every consumer TV was a smart TV. I dunno if you can find cheap-ass TVs that aren't smart anymore.