Got atma today after spending about 4 hour of fate a day

The longest atma for me was 4 hour 13 mins (Atma of the Crab)
The shortest atma for me was around 2 min, by clearing only 1 fate in the region (Atma of the Lion)

The funny thing is on my 8th to 11th atma i got them only 15 min apart from each other, they have one thing in common one being in the same area (la noscea) and only handfull of people doing the fate dunno if this have anything to do with drop rates