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Not a scientific answer, but I seem to recall seeing the figure 10,000 hours somewhere.
"Failure" may be a little imprecise, since many picture tubes just get dimmer and dimmer rather than fail suddenly. When is a dim tube so weak that it must be replaced? Opinions might differ. The Sony color TV/monitor in my office has been played more or less daily since I bought it 26 years ago, and it still looks good to me.
Phil Nelson
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