Does screen burn only occur when it is left on for say 8 hours with a static image or can the effect also manifest over time if the viewing tendencies are a certain way. Say like if 50% of viewing was regular tv or dvd and 50% CBeebies This is not my case at all but I think many can relate to that being "normal use" for a set! I was particularly worried by the one person who had trouble with CBeebies after only 4 hours even though the set was run in and under 50% contrast. Hopefully this was just image retention as I can leave my CRT on with a dvd menu overnight and having done this a good 100+ times, theres not a hint of anything, so I find it hard to believe that the plasma manufacturers claim their sets are comparable. I'm a bit concerned about if the viewing habits tend to be one logoed channel for a lot of the screen life (we don't watch an awful lot) and also the Sky Digi guide and blue bar when channel hopping, done so fast the bar doesn't ever go off lol, as this'll probably occupy a hefty percentage of the screens activity. My logic is that if some phosphors are mostly showing the same thing, it will eventually burn whether it be in 1 year or 5. Is this not the case as people only seem to mention it when accompanied by leaving the set on for several hours in one burn-in session, i.e. is the burn chance lost as long as something breaks up the flow? I'm also curious about image retention, what is the best practice to make sure it isn't a problem. Is normal viewing enough, do you avoid that particular retained source for a bit, give it some white noise?