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My iPhone 7 plus was on 1" of water for 30 seconds and was dead within 5 hours. When I returned it to apple (who sold me a new one at a discount) they stated they have seen a number get returned and it's not waterproof and my experience was the norm from what they have seen/heard.
Bases on on how my phone died after such shallow and short exposure I would consider this a HUGE exception and likely to never be repeated. The phone is not waterproof not even close.