User blog comment:Fearless Diva/Choices Books Schedule (Theory)/@comment-26069469-20180916041344/@comment-3452092-20180917160459

The most they have had in the past was seven, but whether it is a lot of not really depends on how many writers they have hired. From the sound of it, a minimum of two writers work on each book and any book that is in the works probably has writers who aren't working on other projects, so most likely they have something between twenty and thirty writers on staff at this point.