First create solution

Nuvolar.Module.Web/BusinessObjects/Business/ToDoObjects/MySchedule_VC.vb

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+Imports System
+Imports System.ComponentModel
+Imports System.Collections.Generic
+Imports System.Diagnostics
+Imports System.Text
+
+Imports DevExpress.ExpressApp
+Imports DevExpress.ExpressApp.Actions
+Imports DevExpress.Persistent.Base
+Imports DevExpress.ExpressApp.Scheduler.Web
+Imports DevExpress.XtraScheduler
+Imports DevExpress.Web.ASPxScheduler
+
+Public Class MySchedule_VC
+    Inherits Nuvolar.Module.MySchedule_VC
+
+    Public Sub New()
+        MyBase.New()
+        InitializeComponent()
+        RegisterActions(components)
+
+    End Sub
+
+    Protected Overrides Sub OnViewControlsCreated()
+        MyBase.OnViewControlsCreated()
+        If View.Id = "MySchedule_ListView" Or View.Id = "Contacts_CRM_Leads_Activity_ListView" Then
+            Dim currentView As ListView = CType(View, ListView)
+            Dim listEditor As ASPxSchedulerListEditor = CType(currentView.Editor, ASPxSchedulerListEditor)
+            Dim scheduler As ASPxScheduler = listEditor.SchedulerControl
+
+            If Not scheduler Is Nothing Then
+                scheduler.Views.DayView.VisibleTime = New TimeOfDayInterval(New TimeSpan(7, 0, 0), New TimeSpan(19, 0, 0))
+                scheduler.Views.WorkWeekView.VisibleTime = New TimeOfDayInterval(New TimeSpan(7, 0, 0), New TimeSpan(19, 0, 0))
+            End If
+        End If
+    End Sub
+End Class