First off, let me say I don’t speak for the GWC crüe. This is an interpretation of what has been said and posted. Like any good rule, their’s can be broken, bent or splintered as they see fit. However, for the purposes of conversation let’s talk about what an “arc” is. (no, I’m not looking at you Indy).
As Chuck put it, An arc is:
“a group of two to ten podcasts with each group discussing a particular subject”
What does that mean exactly? My interpretation is that we provide ideas for podcasts that span multiple 'casts. For example, suggesting “Solaris” as an arc doesn’t really work as one movie would only be one podcast. Suggesting a podcast arc for, “All the even numbered Star Trek movies”, “Danny Elfman movies” or “Sci-fi Movies 101” would be arcs.
The other important note would be that the upper limit is 10. Suggesting a podcast arc to watch season 5 of Star Trek TNG wouldn’t work as there is too much to be viewed.