diff --git a/openslides/agenda/migrations/0002_duration.py b/openslides/agenda/migrations/0002_duration.py
new file mode 100644
index 000000000..3c183544f
--- /dev/null
+++ b/openslides/agenda/migrations/0002_duration.py
@@ -0,0 +1,56 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.1 on 2016-09-22 11:08
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+def convert_duration(apps, schema_editor):
+    Item = apps.get_model('agenda', 'item')
+    for item in Item.objects.all():
+        duration = item.duration
+
+        item.duration_tmp = None
+        if is_int(duration):
+            # assuming that these are minutes
+            item.duration_tmp = int(duration)
+        else:
+            split = duration.split(':')
+            # assuming format (h)h:(m)m
+            if len(split) == 2 and is_int(split[0]) and is_int(split[1]):
+                # duration = hours * 60 + minutes
+                item.duration_tmp = int(split[0]) * 60 + int(split[1])
+        item.save()
+
+
+def is_int(s):
+    try:
+        int(s)
+        return True
+    except ValueError:
+        return False
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('agenda', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='item',
+            name='duration_tmp',
+            field=models.IntegerField(blank=True, null=True),
+        ),
+        migrations.RunPython(convert_duration),
+        migrations.RemoveField(
+            model_name='item',
+            name='duration',
+        ),
+        migrations.RenameField(
+            model_name='item',
+            old_name='duration_tmp',
+            new_name='duration',
+        ),
+    ]
diff --git a/openslides/agenda/models.py b/openslides/agenda/models.py
index 8e1564187..a97d9701a 100644
--- a/openslides/agenda/models.py
+++ b/openslides/agenda/models.py
@@ -220,7 +220,7 @@ class Item(RESTModelMixin, models.Model):
     See Item.ITEM_TYPE for more information.
     """
 
-    duration = models.CharField(null=True, blank=True, max_length=5)
+    duration = models.IntegerField(null=True, blank=True)
     """
     The intended duration for the topic.
     """
diff --git a/openslides/agenda/static/js/agenda/site.js b/openslides/agenda/static/js/agenda/site.js
index 31be6db39..5c9e06eb5 100644
--- a/openslides/agenda/static/js/agenda/site.js
+++ b/openslides/agenda/static/js/agenda/site.js
@@ -112,6 +112,31 @@ angular.module('OpenSlidesApp.agenda.site', ['OpenSlidesApp.agenda'])
         });
         $scope.alert = {};
 
+        $scope.sumDurations = function () {
+            var totalDuration = 0;
+            $scope.items.forEach(function (item) {
+                if (item.duration) {
+                    totalDuration += item.duration;
+                }
+            });
+            return totalDuration;
+        };
+
+        $scope.calculateEndTime = function () {
+            var totalDuration = $scope.sumDurations();
+            var startTime = $scope.config('agenda_start_event_date_time');
+            // This date-time has a fixed structure: DD.MM.YYYY HH:MM
+            if (startTime) {
+                var timestamp = Date.parse(startTime) + totalDuration * 60 * 1000;
+                var endDate = new Date(timestamp);
+                var mm = ("0"+endDate.getMinutes()).slice(-2);
+                var dateStr = endDate.getHours() + ':' + mm;
+                return dateStr;
+            } else {
+                return '';
+            }
+        };
+
         // pagination
         $scope.currentPage = 1;
         $scope.itemsPerPage = 100;
diff --git a/openslides/agenda/static/templates/agenda/item-list.html b/openslides/agenda/static/templates/agenda/item-list.html
index fb6a0469c..e29581c04 100644
--- a/openslides/agenda/static/templates/agenda/item-list.html
+++ b/openslides/agenda/static/templates/agenda/item-list.html
@@ -134,6 +134,12 @@
           <translate>Agenda item</translate>
         <th os-perms="agenda.can_see_hidden_items" class="optional">
           <translate>Duration</translate>
+          <span ng-if="sumDurations() > 0">
+            {{ sumDurations() | osMinutesToTime }}h
+            <span ng-if="config('agenda_start_event_date_time')">
+              (<translate>Estimated end:</translate> {{ calculateEndTime() }})
+            </span>
+          </span>
         <th class="minimum optional">
           <translate>Done</translate>
     <tbody>
@@ -196,7 +202,7 @@
             </span>
           </div>
         <td ng-show="!item.quickEdit" os-perms="agenda.can_see_hidden_items" class="optional">
-          {{ item.duration }}
+          {{ item.duration | osMinutesToTime }}
           <span ng-if="item.duration" translate-comment="'h' means time in hours" translate>h</span>
         <td ng-if="!item.quickEdit" class="optional">
           <span os-perms="!agenda.can_manage">
@@ -227,7 +233,8 @@
             </div>
             <div class="col-xs-6">
               <label for="inputDuration" translate>Duration</label>
-              <input type="text" ng-model="item.duration" class="form-control input-sm" id="inputDuration">
+              <input type="text" ng-model="item.duration" placeholder="hh:mm" hour-min-format
+                class="form-control input-sm" id="inputDuration">
             </div>
           </div>
           <div class="spacer">
diff --git a/openslides/core/static/js/core/base.js b/openslides/core/static/js/core/base.js
index df98b96fb..147a03819 100644
--- a/openslides/core/static/js/core/base.js
+++ b/openslides/core/static/js/core/base.js
@@ -429,6 +429,29 @@ angular.module('OpenSlidesApp.core', [
     }
 ])
 
+/* Converts number of minutes into string "h:mm" or "hh:mm" */
+.filter('osMinutesToTime', [
+    function () {
+        return function (totalminutes) {
+            if (!totalminutes) {
+                return '';
+            } else {
+                var time = "";
+                if (totalminutes < 0) {
+                    time = "-";
+                    totalminutes = -totalminutes;
+                }
+                var hh = Math.floor(totalminutes / 60);
+                var mm = Math.floor(totalminutes % 60);
+                // Add leading "0" for double digit values
+                mm = ("0"+mm).slice(-2);
+                time += hh + ":" + mm;
+                return time;
+            }
+        };
+    }
+])
+
 .filter('osFilter', [
     function () {
         return function (array, string, getFilterString) {
diff --git a/openslides/core/static/js/core/site.js b/openslides/core/static/js/core/site.js
index 173c457e9..d768045b9 100644
--- a/openslides/core/static/js/core/site.js
+++ b/openslides/core/static/js/core/site.js
@@ -1502,6 +1502,46 @@ angular.module('OpenSlidesApp.core.site', [
     }
 ])
 
+// format time string for model ("m") and view format ("h:mm" or "hh:mm")
+.directive('hourMinFormat', [
+    function () {
+        return {
+            require: 'ngModel',
+            link: function(scope, element, attrs, ngModelController) {
+                ngModelController.$parsers.push(function(data) {
+                    //convert data from view format (hh:mm) to model format (m)
+                    var time = data.split(':');
+                    if (time.length > 1 && !isNaN(time[0]) && !isNaN(time[1])) {
+                        data = (+time[0]) * 60 + (+time[1]);
+                        if (data < 0) {
+                            data = "-"+data;
+                        }
+                    }
+                    if (data === '') {
+                        data = 0;
+                    }
+                    return data;
+                });
+
+                ngModelController.$formatters.push(function(totalminutes) {
+                    //convert data from model format (m) to view format (hh:mm)
+                    var time = "";
+                    if (totalminutes < 0) {
+                        time = "-";
+                        totalminutes = -totalminutes;
+                    }
+                    var hh = Math.floor(totalminutes / 60);
+                    var mm = Math.floor(totalminutes % 60);
+                    // Add leading "0" for double digit values
+                    mm = ("0"+mm).slice(-2);
+                    time += hh + ":" + mm;
+                    return time;
+                });
+            }
+        };
+    }
+])
+
 .directive('osFocusMe', [
     '$timeout',
     function ($timeout) {