Hello,

how can i set the time a user can edit his posted Thread in a club forum ?

 

Per post or per whole topic?

A user created a Thread in his club and closed it and now he wants to edit it and add informations

The edit time is a member group option. 

In your case, it might be better to check the moderator settings for clubs, as you say it’s “his club”, in which case, you can grant permission to edit anything in the club at all times.