diff --git a/js/app/AmdaApp.js b/js/app/AmdaApp.js
index fc858d0..9dcabfd 100755
--- a/js/app/AmdaApp.js
+++ b/js/app/AmdaApp.js
@@ -188,6 +188,9 @@ Ext.define('amdaApp.AmdaApp', {
 	{
 		// custom logic before getXYZ methods get called...
 		this.callParent();
+
+		// TT duration management
+        Ext.state.Manager.getProvider().set('tt_duration', 4);
 		
 		// now ready...
 		//override createWindow method of desktop
diff --git a/js/app/views/TimeTableUI.js b/js/app/views/TimeTableUI.js
index 112a731..f1ded07 100755
--- a/js/app/views/TimeTableUI.js
+++ b/js/app/views/TimeTableUI.js
@@ -18,7 +18,8 @@ Ext.define('amdaUI.TimeTableUI', {
         'Ext.ux.grid.filter.NumericFilter',
         'amdaUI.OperationsTT',
         'amdaUI.StatisticalPlug',
-        'Ext.grid.plugin.BufferedRenderer'
+        'Ext.grid.plugin.BufferedRenderer',
+        'amdaDesktop.AmdaStateProvider'
     ],
 
     statics: {
@@ -51,7 +52,7 @@ Ext.define('amdaUI.TimeTableUI', {
 
         Ext.Array.each(this.TTGrid.headerCt.getGridColumns(), function (item, index, all) {
             // if item is the default duration column
-            if (item.id == amdaUI.TimeTableUI.COL_TO_HIDE + '2') {
+            if (item.id == amdaUI.TimeTableUI.COL_TO_HIDE + Ext.state.Manager.getProvider().get('tt_duration').toString()) {
                 // show this column
                 item.show();
             }
@@ -578,6 +579,7 @@ Ext.define('amdaUI.TimeTableUI', {
             store: store,
             features: [filters],
             columnLines: true,
+            me:this,
             selModel: {pruneRemoved: false},
 
             countDecimals: function (value) {
@@ -643,7 +645,7 @@ Ext.define('amdaUI.TimeTableUI', {
                 {
                     header: 'Duration (day)', width: 120, dataIndex: 'durationDay',
                     id: amdaUI.TimeTableUI.COL_TO_HIDE + '1',
-                    hidden: true,
+                    hidden: Ext.state.Manager.getProvider().get('tt_duration') != 1 ? true : false,
                     renderer: function (value) {
                         return this.dateToString(value);
                     },
@@ -665,7 +667,7 @@ Ext.define('amdaUI.TimeTableUI', {
                 {
                     header: 'Duration (hour)', width: 120, dataIndex: 'durationHour',
                     id: amdaUI.TimeTableUI.COL_TO_HIDE + '2',
-                    hidden: true,
+                    hidden: Ext.state.Manager.getProvider().get('tt_duration') != 2 ? true : false,
                     renderer: function (value) {
                         return this.dateToString(value);
                     },
@@ -686,6 +688,7 @@ Ext.define('amdaUI.TimeTableUI', {
                 },
                 {
                     header: 'Duration (min)', width: 120, dataIndex: 'durationMin',
+                    hidden:Ext.state.Manager.getProvider().get('tt_duration') != 3 ? true : false,
                     id: amdaUI.TimeTableUI.COL_TO_HIDE + '3',
                     renderer: function (value) {
                         return this.dateToString(value);
@@ -708,7 +711,7 @@ Ext.define('amdaUI.TimeTableUI', {
                 {
                     header: 'Duration (sec)', width: 120, dataIndex: 'durationSec',
                     id: amdaUI.TimeTableUI.COL_TO_HIDE + '4',
-                    hidden: true,
+                    hidden:Ext.state.Manager.getProvider().get('tt_duration') != 4 ? true : false,
                     renderer: function (value) {
                         return Ext.util.Format.number(value, '0.000');
                     },
@@ -800,8 +803,15 @@ Ext.define('amdaUI.TimeTableUI', {
                         //  send refresh event to statistical plugin
                         this.fireEvent("refresh");
                     }
+                },
+                columnschanged:function(ct,eOpts){ // Takes into count the duration changes
+                    Ext.Array.each(ct.getGridColumns(), function (item, index, all) {
+                        if (Ext.util.Format.substr(item.id, 0, amdaUI.TimeTableUI.COL_TO_HIDE.length) == amdaUI.TimeTableUI.COL_TO_HIDE && !item.isHidden()) {
+                            var durationNumber = parseInt(Ext.util.Format.substr(item.id, amdaUI.TimeTableUI.COL_TO_HIDE.length, amdaUI.TimeTableUI.COL_TO_HIDE.length+1));
+                            Ext.state.Manager.getProvider().set('tt_duration', durationNumber);
+                        }
+                    });
                 }
-
             }
         });
 
--
libgit2 0.21.2