diff --git a/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/DurationTiming.java b/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/DurationTiming.java
index 9328122e59a2..04627b241bce 100644
--- a/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/DurationTiming.java
+++ b/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/DurationTiming.java
@@ -54,7 +54,7 @@ public DurationTiming mergeWith(DurationTiming other)
     {
         long durationNanos = duration.roundTo(NANOSECONDS);
         long otherDurationNanos = other.getAirliftDuration().roundTo(NANOSECONDS);
-        return new DurationTiming(new Duration(durationNanos + otherDurationNanos, NANOSECONDS).convertToMostSuccinctTimeUnit());
+        return new DurationTiming(new Duration(durationNanos + otherDurationNanos, NANOSECONDS));
     }
 
     @Override
@@ -80,7 +80,7 @@ public int hashCode()
     public String toString()
     {
         return toStringHelper("")
-                .add("duration", duration)
+                .add("duration", duration.convertToMostSuccinctTimeUnit())
                 .toString();
     }
 }
diff --git a/lib/trino-plugin-toolkit/src/test/java/io/trino/plugin/base/metrics/TestMetrics.java b/lib/trino-plugin-toolkit/src/test/java/io/trino/plugin/base/metrics/TestMetrics.java
index 4c4c8a5b76ce..965002db8c74 100644
--- a/lib/trino-plugin-toolkit/src/test/java/io/trino/plugin/base/metrics/TestMetrics.java
+++ b/lib/trino-plugin-toolkit/src/test/java/io/trino/plugin/base/metrics/TestMetrics.java
@@ -70,16 +70,19 @@ public void testMergeHistogram()
     @Test
     public void testDurationTiming()
     {
-        DurationTiming d1 = new DurationTiming(new Duration(123, NANOSECONDS));
+        DurationTiming d1 = new DurationTiming(new Duration(1234, NANOSECONDS));
         DurationTiming d2 = new DurationTiming(new Duration(1, NANOSECONDS));
 
+        assertThat(d1.toString()).matches("\\{duration=1.23us\\}");
+
         Metrics m1 = new Metrics(ImmutableMap.of("a", d1));
         Metrics m2 = new Metrics(ImmutableMap.of("a", d2));
 
         DurationTiming merged = (DurationTiming) merge(m1, m2).getMetrics().get("a");
 
-        assertThat(merged.getAirliftDuration().roundTo(NANOSECONDS)).isEqualTo(124);
-        assertThat(merged.getDuration().toNanos()).isEqualTo(124);
+        assertThat(merged.getAirliftDuration().roundTo(NANOSECONDS)).isEqualTo(1235);
+        assertThat(merged.getDuration().toNanos()).isEqualTo(1235);
+        assertThat(merged.toString()).matches("\\{duration=1.24us\\}");
     }
 
     @Test