awaitility/src/main/java/org/awaitility/Duration.java
public Duration minus(long amount) {
        return new Minus().apply(this, unit == null ? FOREVER : new Duration(amount, unit));
    }
public Duration minus(long amount) {
        return new Minus().apply(this, unit == null ? FOREVER : new Duration(amount, unit));
    }
Subtract an amount (with the same time unit as the current amount)

@param amount The amount to add
@return A new amount