This can vary depending on the number of occurrences. (Linkedin Help Centre)
OK. But how could I find out, which group didn't like my post, may be I could share my point with the owner of the group...
I did contact the Help Centre to find this out, but no answer yet. As soon as they will answer, I will post it here.
During the moderation period, your posts won't display immediately and must pass through your group's management team before they appear publicly. (Linkedin Help Centre)
So here is what Linkedin had to say about:
I understand you’re very concerned about this matter. However, please understand that it is not possible for me to disclose the blocked group names, nor do we have access to the content that may have been flagged. Please note that your posting status will return to normal once the moderation period ends, typically less than a few weeks but it can vary depending on the number of occurrences.
Image: Civishir, Linkedin Screenshot
@TamasBANKI is a Linkedin Expert (@DrLinkedin). Joined Linkedin in 2007 and helped over 1700 professionals and students with Linkedin.