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69f180a5ec
In a number of locations in the code, there were conversions of message expiration times from seconds to milliseconds, and then assigned to `long` contexts. However these conversions were being done as integer multiplication rather than long multiplication, meaning that there was a potential for overflows. Specifically, the maximum value that could be represented before overflowing was (2^31 / 1000 / 60 / 60 / 24) days = 24.8 days (< 1 month). Luckily the current allowed timeouts are all less than that value, but this fix would remove the artificial restriction, effectively allowing values of 1000x greater (68 years), at least for android. Related #5775 Closes #7338