diff --git a/queries/cdmq/get-result-summary.js b/queries/cdmq/get-result-summary.js
index aa35e0b4..522369da 100644
--- a/queries/cdmq/get-result-summary.js
+++ b/queries/cdmq/get-result-summary.js
@@ -272,6 +272,11 @@ runIds.forEach((runId) => {
             iterPrimaryPeriodRanges[i][j].end,
           noHtml
         );
+        logOutput('          period length: ' +
+	  ((iterPrimaryPeriodRanges[i][j].end - iterPrimaryPeriodRanges[i][j].begin) / 1000) +
+          ' seconds',
+          noHtml
+        );
         //for (var k=0; k<benchmarks.length; k++) {
         var primaryMetrics = list(iterPrimaryMetrics[i]);
         for (var k = 0; k < primaryMetrics.length; k++) {