Hi thanks for asking.
To be honest it really depends on how much free time I have, I recorded the art process for one level for a speed paint video and it took about 11 hours in total (not including the line work). The music I would guess would take about 5 hours maybe, and then I need to import it into the game which takes about 2 or 3 hours. Then there are the sound effects and animation. I'd estimate that creating one level from scratch would be about 1 - 2 weeks if I was working on it full time. But I'm working on it on my free time so everything takes a lot longer.
I've been trying to figure out my plans more clearly recently and I don't think I will have the full game finished next year, but I'm pretty sure I'll be ready by the first half of 2025.