Problem here is the theory is flawed.

I have max 12 N-girls already even thougth I only played my area 1.3 accound for 7 days so far. I max 2 N-girls per day atm. When all are N-girls are maxed my R-Girls will automatic gain levels much faste - I think I cam max 1 R-Girl per day or so. When all R-Girls are max SR start to gain level more than 25 levels per day I estimnate. Bonus area accound will gain less than 1 SR girl level ofcause per day.

This right here doesn't work. When going through stages and getting a chance time, if the selected card is level 100 already, you do NOT get a level on another card. In stages, you get pero depending on the rarity.

This has already been found out elsewhere.