Menancia features more sub-quests than any other realm in Tales of Arise. There are 21 of them in total, including two of only three post-game quests. As such, those hoping to complete all 70 sub-quests and unlock the Problem Solver trophy/achievement are going to be spending an awful lot of time in the area. It's not all bad though, as some of the rewards available for completing the quests in Menancia are incredibly useful.