2^57 nanoseconds is ~40032 hours. I wouldn't be surprised if someone out there was counting intervals in a 64-bit value and masking off some of the higher bits

2^57 nanoseconds is ~40032 hours. I wouldn't be surprised if someone out there was counting intervals in a 64-bit value and masking off some of the higher bits for flagging. Any time I see these sorts of issues (odometers that kill themselves, for example) I think of smaller units at higher bit depths. That's not the only way to get to this kind of concern, but it's a way that pretty-darn-competent engineers can leave ticking time bombs due to estimation failures. Always check types for overflow and/or precision loss. Always.