heh just counted them girls. 27 with full affection. Most of them 4/5* + Alpina.
Since there is a new girl every two weeks. Plus sometimes the gacha surprises you with new girl as well, I didnt really have the chance to get down to most of those 2/3* (though there are 3 or 4 3* girls that are at 100% affection from the early days of the game).
Not bad if I have to say so myself. :P