I think it really varies. I've been to one meeting where there were 3 of us (it was only a few months old) another with about 8-10, and my home Naranon group was at about 16 when I started 3 years ago and has grown to 25-35. There is another Naranon group nearby that is struggling a bit because they have grown to over 40 each meeting...a little too big to allow everyone who wants it to have time to share.