Last I knew, 5 hours was the limit on editing a post. The same limit was on deleting a post, but only if no one replied to it.
But Alex has been making adjustments lately, so maybe the time-limit has changed.
Personally, if no one responds to a post, no one is under any obligation to delete it.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.