At what point does 3d animation become more efficient/cheapter than 2d animation?

Please take an average scene, at what point (after how many minutes) will doing something in 3d be more cost effective and practical than 2d? is there something like a 28 min mark at which point it’s more practical to do it in 3D?

Example: if the piece is just a few minutes, you will finish it faster and it’ll be cheaper than doing it in 3d, rather than trying to model/texture/light/rig and animate it in 3d (since it’ll take longer and cost more)

Hope the question made sense, tnx