Multiplies this Duration by the given factor and returns the result as a new Duration object.
Note that when factor is a double, and the duration is greater than 53 bits, precision is lost because of double-precision arithmetic.
Duration operator *(num factor) {
return Duration._microseconds((_duration * factor).round());
}
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https://api.dart.dev/stable/2.5.0/dart-core/Duration/operator_multiply.html