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I believe that 'modern' alarms have a maximum sound time of 20 minutes. However, multiple re-triggers will negate that completely.
Walking the dog a couple of months back I noticed a very large piece of paper stuck to a front door. It very rudely informed the householder that his alarm had been ringing all day and that the upset complainant worked nights!
But looking back, I generally think alarms are a lot more reliable now than they used to be 30 years ago.
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