I can also not understand why so many people complain, I literally got every dropable girl of each event in the last year - usually it takes ~7 days to get both, sometimes more, sometimes less. With the revival events, I can see why one would not be able to get both girls, but regular 14 day event are pretty certain to drop both if you use your energy effecently, there were not many events where it took me more than 10 days to get both girls.