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Got mine at approx 3:30pm on WRA server. It was raining when I logged in so I'm not sure how long it was going, but it lasted for 45 minutes while I was there. I managed to nab a rare and a couple uncommons.
One weird thing to note -- after about 15-20 minutes, all the baby apes disappeared, but it was still raining. I thought they were gone for good and was about to leave when a whole new batch spawned. So, if you get to the island and it's raining, but don't see any pets, wait a few. :)