As many as I can produce
Honestly, I'm looking to do at least a year's worth, if not more. In the coming months, we'll be releasing some Teams and Schemes books as well, so please keep an eye out for them. Thanks for the compliment, hoping that they continue to be fun and please let us know how you're using them in your campaign.
Also, for everyone interested, please drop us a line at firstname.lastname@example.org
with any questions or comments. We're trying to put a small letter page in the issues and are also running a contest for the letter column name. If your name is picked, you'll win a free issue of AoV: Solo!