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In my opinion all electronic devices wear out over time...so running it all the time would shorten its life.
However power surges with constantly turning things on and off greatly shortens life span also.
But in my case I just wired it up to the reverse lights...so it is powered when I am in reverse...and the screen switches to the reverse camera at the same time.
In your case, I don't think running a camera 3 hours a day would be a big deal at all.
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