public void setManualSnapshotRetentionPeriod(Integer manualSnapshotRetentionPeriod) {
        this.manualSnapshotRetentionPeriod = 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>

@param manualSnapshotRetentionPeriod
       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