Thank you very much! It’s difficult to respond to this because we’re not talking about a continuous process, but rather combining various existing parts of different projects.
The forest was already done, right? I did that for completely different reasons.
The metahuman head was already a base for a character in my upcoming movie
“Fortunate Son.” you can check it out here 
The motion and facial expressions I recorded specifically for this. So, there isn’t a precise starting point for this project, which makes it difficult to answer in this way.
But if I were to create everything from scratch for this now, I would say it would take about 10 days to achieve it from scratch.