You need to set the cache time to 1 minute.
For a widget this is done via the Configure link.
For a forum block this is done via the Edit link.
If the cache time is set too high, say 60 minutes, then a visitor may get a countdown that could be up to an hour out of date.
Even at 1 minute it will take up to 1 minute before a change in an edited event is replicated in the countdown.
If you're in a time zone that's currently using DST you should check your event as soon as DST ends as it may be an hour out in the countdown.
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