I think it would be helpful to display the total animation duration in seconds in preview mode. Sure, it’s just a multiplication of frame duration by the number of frames, but having it shown directly next to the single frame duration would make things faster.
This would make it easier to visualize and synchronize timers, and to swap animations as smoothly as possible.
There are situations where you don’t want to rely on the “animation finished” condition, because unwanted behavior can occur if the animation is changed before it finishes, or if you’re switching animations within the same state (e.g., some idle transitions). While it’s possible to handle this, I sometimes use timers instead. Being able to see the total animation duration helps me set the tempo in timers more accurately—even if they’re not perfectly in sync.
It would also be useful for estimating the total number of loops or for triggering events at a specific (estimated) time, without needing to know exactly which frame the animation is on.