I've just noticed that this question converted to Community Wiki after 16 answers had been posted.

I thought that the threshold was after the 30th answer had been posted.

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2 Answers 2

up vote 8 down vote accepted

As detailed in the answer to this question on Meta Stack Overflow, the threshold can be set on a site by site basis and is now 15 for Programmers (along with Super User, where the threshold was originally reduced in an effort to stem the tide of pile-on answers).

It doesn't affect existing questions, but if a new answer is posted to those they will convert.

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As of April 9th 2014, all of the automatic triggers that convert a post to community wiki have been removed.

This includes the trigger for the nth answer (which was site dependent) and the mth edit to a post.

The corresponding blog post announcing these changes is Putting the Community back in Wiki.

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