Edited posts do not show "Last Edited By ..."

I just edited a post of mine (of course, whose else?) in the Java forum, and could not find the words

Quote:

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Last edited by honeybee blah blah

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I am attaching a screenshot after the post was edited. The line with "btw:" was added later.

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How much later? I believe you get five minutes or so to make changes before it shows that message.