why waterproof phones (e.g. IP68) can only stay underwater for a limited time, and not indefinitely
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IP68 is an engineering standard that says a phone can be submerged up to 1.5m for 30 min.
So the stupid answer is simply that the phone doesn’t have to do any better than that to get the cert so it won’t, especially if the process of making it more waterproof costs more money.
The more broad answer is that a standard is a minimum spec under controlled conditions. If your phone has some wear and tear (a crack, been exposed to temperature extremes, etc) then it may not hold up in water at all. But it’s also possible that the engineering that was used holds up to a higher standard, but only claims a lower standard for liability reasons.
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