Hello, I really like cute asian stile and I'll be hppy to work at this project!
I think 7 days could be the best way to have a good relation between quality and time. Unfortunatelly I couldn't be sure about how much work this game will needs so, I prefer to consider 2 or 3 days plus of what I suppose (to be sure of the delivery date is respected!) So that why I chose 10 days of work, but maybe could be less! For more info see PMB.