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I haven't looked at the clock in question, but my guess is that there are some BHAVs in there that check how long the clock has been in use (and possibly also other variables that would effect its life expectancy) and then decide if and when it should break. In that case, you'd want to tweak the "should break" BHAV, for example by changing how many hours the clock can run before it breaks.
Looking at the mods you have, like Mootilda suggests, sounds like a good starting place to help you figure out how to do that.