The Challenge requires that you spend at least 15 minutes per day working on each assignment. You also get opportunities to profile a protagonist, an antagonist, and two minor characters, all on separate days. You could choose to use the minor character assignments for your additional protagonists/antagonists, or you could choose to profile multiple characters on a given day. The Prep allows some amount of flexibility because most projects are different, so as long as you meet the 15-minute minimum writing time, it counts toward prizes.

If I had multiple protagonists, I would try to profile all of them at some point, just because their characters and history will be critical to the story in November.

Regards,
Michelle