<p>I had debated on posting <a href="https://stats.stackexchange.com/questions/28047/effective-way-to-visualize-net-growth-profit-income#comment52381_28047">a similar question awhile ago</a> so I have collected a few links on the subject.</p>

<ul>
<li>There is actually a <a href="https://meta.stackexchange.com/questions/tagged/cross-posting">cross-posting tag</a> on Meta Stackoverflow. And the highest voted question is <a href="https://meta.stackexchange.com/q/64068/150339">Is cross-posting a question on multiple Stack Exchange sites permitted if the question is on-topic for each site?</a> This is clearly in line with favoring migration as oppossed to cross-posting in all circumstances.</li>
<li>Here is <a href="https://skeptics.meta.stackexchange.com/a/620">Jeff Atwood</a> saying it is abuse to copy and paste questions on different sites.</li>
<li><a href="https://meta.stackexchange.com/q/167476/150339">Is it OK to cross-post an old, unanswered question?</a> This suggests that an old, unanswered question is ok to repost it as long as you link back to the original and tailor it to the new site.</li>
</ul>

<p>I think it is easier to speak in terms of potentially irksome behavior and try to limit that specifically as opposed to the obverse. For me, things I find irksome are:</p>

<ol>
<li>Not linking to the other discussions</li>
<li>Cross posting multiple questions immediately</li>
</ol>

<p>The first should always be done and is not in debate as far as I can tell. The second seems to have less agreement, for both how long is reasonable to wait and whether you need to wait at all. Some of the motivation for cross-posting immediately is stated to ask the question to different audiences. I am not very bemused by this answer, as it is IMO a good indication your question is either subjective or lacks information that would make one receive similar answers on different sites. In combination without linking is taking advantage of the goodwill of the community to help, as one is likely in many circumstances to receive duplicated answers across sites.</p>

<p>I'm not sure what suggestions to give as to how long is reasonable to wait. I would personally say multiple days if not a week or longer - others seem to have different expectations though as to how fast questions are answered (a good question for the data explorer when I get a chance).</p>

<p>Either case I don't think the linked question by Michael Hardy is irksome. He waited a day and cross-posted. Last I knew MathOverflow wasn't a stackexchange site, so migrating isn't even an option.</p>
