Try with this
Dim dt As Date
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
dt = DateTime.Now()
dt = DateAdd(DateInterval.Minute, 1, DateTime.Now())
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If DateTime.Now() > dt Then
Form2.Show()
Timer1.Enabled = False
Exit Sub
End If
End Sub