diff --git a/enrol/manual/ajax.php b/enrol/manual/ajax.php
index 94ccd7b11f0..ad454c47a4c 100644
--- a/enrol/manual/ajax.php
+++ b/enrol/manual/ajax.php
@@ -120,7 +120,7 @@ switch ($action) {
         }
 
         $roleid = optional_param('role', null, PARAM_INT);
-        $duration = optional_param('duration', 0, PARAM_INT);
+        $duration = optional_param('duration', 0, PARAM_FLOAT);
         $startdate = optional_param('startdate', 0, PARAM_INT);
         $recovergrades = optional_param('recovergrades', 0, PARAM_INT);
 
@@ -154,7 +154,7 @@ switch ($action) {
         if ($duration <= 0) {
             $timeend = 0;
         } else {
-            $timeend = $timestart + ($duration*24*60*60);
+            $timeend = $timestart + intval($duration*24*60*60);
         }
 
         $instances = $manager->get_enrolment_instances();
diff --git a/enrol/manual/lib.php b/enrol/manual/lib.php
index b50e3cc1a0d..f4848273411 100644
--- a/enrol/manual/lib.php
+++ b/enrol/manual/lib.php
@@ -239,7 +239,7 @@ class enrol_manual_plugin extends enrol_plugin {
         $today = make_timestamp(date('Y', $now), date('m', $now), date('d', $now), 0, 0, 0);
         $startdateoptions[3] = get_string('today') . ' (' . userdate($today, $dateformat) . ')';
         $startdateoptions[4] = get_string('now', 'enrol_manual') . ' (' . userdate($now, get_string('strftimedatetimeshort')) . ')';
-        $defaultduration = $instance->enrolperiod > 0 ? $instance->enrolperiod / 86400 : '';
+        $defaultduration = $instance->enrolperiod > 0 ? $instance->enrolperiod / DAYSECS : '';
 
         $modules = array('moodle-enrol_manual-quickenrolment', 'moodle-enrol_manual-quickenrolment-skin');
         $arguments = array(
diff --git a/enrol/manual/manage.php b/enrol/manual/manage.php
index 82d7a31870b..17627f8d605 100644
--- a/enrol/manual/manage.php
+++ b/enrol/manual/manage.php
@@ -89,8 +89,8 @@ if ($extendperiod) {
 } else {
     $defaultperiod = $instance->enrolperiod;
 }
-if (!isset($periodmenu[$defaultperiod])) {
-    $periodmenu[$defaultperiod] = get_string('numdays', '', floor($defaultperiod / DAYSECS));
+if ($instance->enrolperiod > 0 && !isset($periodmenu[$instance->enrolperiod])) {
+    $periodmenu[$instance->enrolperiod] = format_time($instance->enrolperiod);
 }
 if (empty($extendbase)) {
     if (!$extendbase = get_config('enrol_manual', 'enrolstart')) {
diff --git a/enrol/manual/yui/quickenrolment/quickenrolment.js b/enrol/manual/yui/quickenrolment/quickenrolment.js
index d3a1468474b..fde75073997 100644
--- a/enrol/manual/yui/quickenrolment/quickenrolment.js
+++ b/enrol/manual/yui/quickenrolment/quickenrolment.js
@@ -227,6 +227,7 @@ YUI.add('moodle-enrol_manual-quickenrolment', function(Y) {
         populateDuration : function() {
             var select = this.get(UEP.BASE).one('.'+CSS.ENROLMENTOPTION+'.'+CSS.DURATION+' select');
             var defaultvalue = this.get(UEP.DEFAULTDURATION);
+            var prefix = Math.round(defaultvalue) != defaultvalue ? '≈' : '';
             var index = 0, count = 0;
             var durationdays = M.util.get_string('durationdays', 'enrol', '{a}');
             for (var i = 1; i <= 365; i++) {
@@ -237,8 +238,9 @@ YUI.add('moodle-enrol_manual-quickenrolment', function(Y) {
                 }
                 select.append(option);
             }
-            if (!index) {
-                select.append(create('<option value="'+defaultvalue+'">'+durationdays.replace('{a}', defaultvalue)+'</option>'));
+            if (!index && defaultvalue > 0) {
+                select.append(create('<option value="'+defaultvalue+'">'+durationdays.replace('{a}',
+                    prefix + (Math.round(defaultvalue * 100) / 100))+'</option>'));
                 index = ++count;
             }
             select.set('selectedIndex', index);