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@markgritter

https://pkg.go.dev/time#Duration :

> A Duration represents the elapsed time between two instants as an int64 nanosecond count. The representation limits the largest representable duration to approximately 290 years.

and so .Sub caps the return value:

https://pkg.go.dev/time#Time.Sub :

> If the result exceeds the maximum (or minimum) value that can be stored in a Duration, the maximum (or minimum) duration will be returned.