I spent exactly 2 months on this development, considering that I started from scratch learning all the programs including HS2, AE, Ren`py, PS, Pr, and spent another month to set up and make a working UI, in the end it took me 3 months.
I was planning to make the next update 2 times bigger in terms of content and release it 6 months later, but from what I've seen, I think I can do it in 3 months, because I already have everything ready and set up.