Create an Unbound TextBox on your form and call it txtTimer, set its default value to 10. Copy and paste the code below changing "YourButton" to the Name of the button you want to disable.
Code:
Private Sub Form_Open(Cancel As Integer)
Me.txtTimer.SetFocus
Me.TimerInterval = 1000
End Sub
Private Sub Form_timer()
Me.txtTimer = Me.txtTimer - 1
If Me.txtTimer = 0 Then
Me.TimerInterval = 0
Me.YourButton.Enabled = False
End If
End Sub