public void setFrequencyInSeconds(Integer frequencyInSeconds) {
        this.frequencyInSeconds = frequencyInSeconds;
    }
<p>
The frequency that a message is sent to the user. When the period ends, Amazon Lex chooses a message from the
message groups and plays it to the user. If the fulfillment Lambda returns before the first period ends, an
update message is not played to the user.
</p>

@param frequencyInSeconds
       The frequency that a message is sent to the user. When the period ends, Amazon Lex chooses a message from
       the message groups and plays it to the user. If the fulfillment Lambda returns before the first period
       ends, an update message is not played to the user.
aws-java-sdk-lexmodelsv2/src/main/java/com/amazonaws/services/lexmodelsv2/model/FulfillmentUpdateResponseSpecification.java