const time.maxDuration

5 uses

	time (current package)
		time.go#L616: 	maxDuration Duration = 1<<63 - 1
		time.go#L839: 	return maxDuration // overflow
		time.go#L849: 		return maxDuration
		time.go#L890: 			return maxDuration // t - u is positive out of range
		time.go#L905: 		return maxDuration // t - u is positive out of range