The length of the story in Avatar Frontiers of Pandora isn't fixed. It depends on your playstyle and how much you delve into side quests and exploration. On average, players can expect to spend a decent amount of time immersed in the story and its world.
The story duration of Avatar Frontiers of Pandora is quite flexible. If you just focus on the main quests, it might be shorter, but if you take your time to uncover all the secrets and complete various side activities, it can extend significantly. So, it really depends on your gaming approach.