Having experienced a forum troll on another site (well actually he was just an obnoxious two faced git :augie ) who had the habit of editing when he realised he was wrong , giving the reason given as something like edited for typos, I don't reckon indefinitely available editing is a good idea.
If it is that large a post then type it in Word first and check for typos before you post.As honest as I am, I can see your point, but could the time not be extended to 30 Min's or hour max for typos or to add more info or links.
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