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I've done a huge number of hours on sentry duty (unmedicated) and the the hour would either pass by in an instant and I wouldn't even realise it, or it would seem to drag on for hours.

One thing I certainly couldn't do was pay attention to nothing happening for an hour just incase something happened.

...assuming the person is able to focus on the 30 minutes of nothing that comes before the noise.

The person in my life with ADHD would start scribbling equations in the dirt or braid the loose threads on their clothing after five minutes, and easily fail to notice the noise twenty-ive minutes after that.

That's not how ADHD works though.