diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/common/components/EffortDurationPicker.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/common/components/EffortDurationPicker.java
index ec3d35e4a..dc46557f2 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/common/components/EffortDurationPicker.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/common/components/EffortDurationPicker.java
@@ -59,17 +59,22 @@ public class EffortDurationPicker extends Hbox {
         minutes = new Spinner();
         minutes.setCols(2);
         setRangeFor(minutes, 0, 59);
-        appendWithLabel(hours, _("Hours"));
-        appendWithLabel(minutes, _("Minutes"));
+        appendWithTooltipText(hours, _("Hours"));
+        appendWithTooltipText(minutes, _("Minutes"));
 
         if (withseconds) {
             seconds = new Spinner();
             seconds.setCols(2);
             setRangeFor(seconds, 0, 59);
-            appendWithLabel(seconds, _("Seconds"));
+            appendWithTooltipText(seconds, _("Seconds"));
         }
     }
 
+    private void appendWithTooltipText(Spinner spinner, String label) {
+        spinner.setTooltiptext(label);
+        appendChild(spinner);
+    }
+
     private void appendWithLabel(Spinner spinner, String label) {
         Vbox column = new Vbox();
         column.appendChild(new Label(label));