Hi there! Nice reaction. Answering your question: Yes, there's an interview from October 2021 where they said that they usually take only 2-3 days to make the music, but if the original content is a little hard to make they can even take one week. That's why they upload one video per week every friday. The process would be the arragement (which member will do what sound), recording the sounds and edit all of them together. I hope I could helped you, I'm a big Maytree fan!