public static com.google.cloud.websecurityscanner.v1alpha.ScanConfig.Schedule
        getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }
<pre>
Required. The duration of time between executions in days.
</pre>

<code>int32 interval_duration_days = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1alpha/src/main/java/com/google/cloud/websecurityscanner/v1alpha/ScanConfig.java