Hi Annette, that's great if you invite others. I would say it's open to anyone who has read the book or done a course or had some basic introduction like that. Probably not suitable for total beginners who are just curious and hoping to have everything explained from scratch. Speaking for myself, that would not meet my needs for mutual support and would be a different type of group.
I'm pretty open to different technical platforms - zoom, MS teams, facebook messenger video, google meet, etc. Unless one of us has a paid zoom account I think the time limit would be 40 minutes. An hour sounds like what we'd aim for, possibly with the option of some folks staying later if they wish.