public Builder clearIntervalDurationDays() {
        bitField0_ = (bitField0_ & ~0x00000002);
        intervalDurationDays_ = 0;
        onChanged();
        return this;
      }
<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-v1beta/src/main/java/com/google/cloud/websecurityscanner/v1beta/ScanConfig.java