Talk:AFK / Overnight AP Farming
Another thing that can interrupt your AFK session is Prompto asking about which person you want to see more in the photos, because the game will prompt a message box that has to be dismissed by pressing X. So, I would add to the requirements "Wait until Prompto inquires about who you want to see in the photos before going AFC (away from controller)".
I successfully left the game running overnight for more than 6 hours without any other interruptions popping up. However, if one is attempting this before finishing all photo shoot side quests, Prompto might interrupt the trip asking to stop for a photo opportunity (as I believe the default answer is 'Sure').
Yet another of Prompto's annoyances that can interrupt your AP farming is him requesting to stay in a hotel when you approach an outpost. I do not know exactly what prompts Prompto (no pun intended) to ask for a break-time, so I cannot propose any strategies to eliminate this potential hindrance.