I think 24 hours is probably a fair window of time. I know that I ( not here) have felt guilty in the past of saying something that at the time seemed appropriate but an hour or so later I came to the conclusion that maybe it was abrupt so I went back and made it sound better. I guess if you don't realize within a day that you may have torked someone off or said something way off the path, more than 24 hours won't much matter !
Lately in some forums I find myself typing and deleting before sending the post, that way I can say whatever I want and nobody ever has to know what I said !
I'm weak..
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ps I edited this already for spelling and grammar !