const time.maxDuration

4 uses

	time (current package)
		time.go#L587: 	maxDuration Duration = 1<<63 - 1
		time.go#L809: 	return maxDuration // overflow
		time.go#L847: 			return maxDuration // t - u is positive out of range
		time.go#L862: 		return maxDuration // t - u is positive out of range