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A question can be a duplicate of more than one question. Moderators and users with gold tag badges can add questions to the list of questions that a given question is a duplicate of. I was recently closing a question as a duplicate and I saw a lot of similar questions. This led me to wonder: Is there any limit to how many questions I can add to the list? Can I just keep on adding more questions forever, or will the system stop me at some point?

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  • This seems to imply 3 but it's not clearly and boldly written, 3 is the most I've seen.
    – Rob
    Jan 5, 2020 at 22:32
  • @Rob There was one with four targets that got deleted today.
    – Sonic the Save Ukraine-hog
    Jan 5, 2020 at 22:56
  • @SonictheAnonymousHedgehog Can you find one with more, give us a FAQ link, or edit the Sandbox question to see how many you can stuff in there.
    – Rob
    Jan 5, 2020 at 22:59
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    @Rob Don't have a gold badge. 10k+ users can see an example here, and I've pinged someone who probably knows more about it.
    – Sonic the Save Ukraine-hog
    Jan 5, 2020 at 23:00
  • It's an interesting related question, now that we have three vote close (even single vote close on a couple of sites), if that affects the length of the duplicate list.
    – Rob
    May 17, 2021 at 2:34

2 Answers 2

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Can't find an official post on this, but the highest amount of dupe-targets I've encountered is five. I wrote a quick SEDE query sorting the posts by number of dupe targets coming from it, and this seems to confirm that "five" assumption.

SELECT 
  pl.PostId AS [Post Link],
  COUNT(LinkTypeId) AS 'Number of dupe-targets'

FROM PostLinks pl

WHERE pl.LinkTypeId=3 

GROUP BY pl.PostId

ORDER BY 'Number of dupe-targets' DESC

screenshot of results

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Apparently I should have just tried this before asking. The "add" button is no longer clickable (it is faded out) once there are five questions in the list:

Screenshot showing ability to add when there are only four questions

Screenshot showing the inability to add when there are five questions

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  • It's possible that this is just the UI, and you can fudge the request to allow for more targets.
    – Sonic the Save Ukraine-hog
    Jan 5, 2020 at 23:17
  • @SonictheAnonymousHedgehog there is a server side check as well, the 'save' call returns a 500 error message: i.stack.imgur.com/q5xUF.png
    – Glorfindel Mod
    Jan 6, 2020 at 7:22

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