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The seconds accessor property of Temporal.Duration instances returns an integer representing the number of seconds in the duration.
Unless the duration is balanced, you cannot assume the range of this value, but you can know its sign by checking the duration's sign property. If it is balanced to a unit above seconds, the seconds absolute value will be between 0 and 59, inclusive.
The set accessor of seconds is undefined. You cannot change this property directly. Use the with() method to create a new Temporal.Duration object with the desired new value.