The only "standart" girl left unclaimed for me is Willow from Karole. And from the day the update rolls in I've been farming only her. So thats make around 5 days or something and guess how many fragments i've got? 25. Legendary event will continue for 4 days with the same amount of shards (1 to 3) as Karole fight gives. So I think that I don't underestimate the drop rates and they are low as hell, but we'll see