one of the things you can drop onto a form ( like you drop a text box) is a timer. You would also need to create an action listener for your timer. i'm not sure on details of adding controls on the fly to a form, but you should easily be able to switch the visible status.
sounds like i fell into java syntax with 'action listener' but you click the lightning bolt in the control properties thing and add essentially a listener for your timer control. i wrote mine out in code first then linked it through that lightning bolt. google c# timer maybe get all the info you need.
For Each ctrl As Control In Me.Controls("pnlMainPanel").Controls
If ctrl.GetType Is GetType(System.Windows.Forms.Panel) Then
For Each subCtrl As Control In ctrl.Controls
If subCtrl.GetType Is GetType(System.Windows.Forms.TextBox) Then
If subCtrl.GetType Is ...