fun toLongNanoseconds(): Long
Returns the value of this duration expressed as a Long number of nanoseconds.
If the value doesn't fit in the range of Long type, it is coerced into that range, see the conversion Double.toLong for details.
The range of durations that can be expressed as a Long number of nanoseconds is approximately ±292 years.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.time/-duration/to-long-nanoseconds.html