In theory it is unlimited, but in real life you will hit some limitations once you go over 1/2000 forums (there are some numbers mentioned at vb.com, but there is no fixed limit).
You would get into trouble because the forum list with all the forum descriptions (hence short descriptions can handle more forums) in the datastore. Also you will hit some memory limits pretty fast if all this data is loaded into memory for each session.
To get an offocial answer, i suggest you also ask at vb.com.
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