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I think I got lucky.  I used 28 whistles in one session on iOS. (I did visit one neighbor after I cleared the area of tents to refresh them). I had 7 out of 28 dropped something from the collection.    Only Sky Captain active.  Even at that rate...in 11 days I'd have 77 drops, and with all the extra collection items that are usually acquired, I might have trouble getting the 25 for five complete collections.