Returns a copy of this duration with the specified duration _in hours subtracted.
!(p)
The number of hours is multiplied by 3600 to obtain the number of seconds to subtract.
!(p)
This instance is immutable and unaffected by this method call.
@param hoursToSubtract the hours to subtract, positive or negative
@return a {@code Duration} based on this duration with the specified hours subtracted, not null
@throws ArithmeticException if numeric overflow occurs
Returns a copy of this duration with the specified duration _in hours subtracted. !(p) The number of hours is multiplied by 3600 to obtain the number of seconds to subtract. !(p) This instance is immutable and unaffected by this method call.
@param hoursToSubtract the hours to subtract, positive or negative @return a {@code Duration} based on this duration with the specified hours subtracted, not null @throws ArithmeticException if numeric overflow occurs