public void setReturnableUntil(String returnableUntil) {
        this.returnableUntil = returnableUntil;
    }
<p>
The time until when a return for the Savings Plan can be requested. If the Savings Plan is not returnable, the
field reflects the Savings Plan start time.
</p>

@param returnableUntil
       The time until when a return for the Savings Plan can be requested. If the Savings Plan is not returnable,
       the field reflects the Savings Plan start time.
aws-java-sdk-savingsplans/src/main/java/com/amazonaws/services/savingsplans/model/SavingsPlan.java