Ok, it may be too early (I submitted 5-10 days ago || don't remember exactly) but ... don't know, maybe something went wrong.

I followed strictly the submission guidelines in the archive.

Is it normal it takes so much time to have a story published ?

As far as I remember it was way shorter before (I submitted stories years ago).

Or maybe the guide in the Archive is outdated and I have to follow another one ?

You're likely o.k. and Bella simply hasn't gotten to it yet. Sometimes it takes a week or two for a story to show up.