If its tweened like the JIJI animation, it only took me around +20hrs.
Just this frame by frame animation, about +60hrs.
It took me +120hrs to do a 1min animation.
I guess if your pro its much faster, but since anime is Frame by frame.
If its a simple anime *Chibi, then solo and weeks worth of effort. You could probably make a OVA.
But if its Mappa lvl / Chainsawman. Ughhh GOODLUCK MATE!
Damn, my friend for some reason thinks it's easy XD. That's too much screen on time for a person working on a very small project.
Thanks Takuri :)