public Integer getManualSnapshotRetentionPeriod() {
        return this.manualSnapshotRetentionPeriod;
    }
<p>
The number of days that a manual snapshot is retained. If you specify the value -1, the manual snapshot is
retained indefinitely.
</p>
<p>
The number must be either -1 or an integer between 1 and 3,653.
</p>
<p>
If you decrease the manual snapshot retention period from its current value, existing manual snapshots that fall
outside of the new retention period will return an error. If you want to suppress the errors and delete the
snapshots, use the force option.
</p>

@return The number of days that a manual snapshot is retained. If you specify the value -1, the manual snapshot
        is retained indefinitely.</p>
        <p>
        The number must be either -1 or an integer between 1 and 3,653.
        </p>
        <p>
        If you decrease the manual snapshot retention period from its current value, existing manual snapshots
        that fall outside of the new retention period will return an error. If you want to suppress the errors
        and delete the snapshots, use the force option.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/BatchModifyClusterSnapshotsRequest.java