Should it be more accurate? I can’t say. 2 minutes in 3 weeks is not unusual for a car clock. That’s one second gained every 15,120 seconds or 1 in 4.2 hours. If my clock was that far out, I’d set it back 2 minutes so that in 3 weeks it will be on time and in 2 more weeks it will be 2 minutes ahead.
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