Option Explicit
Dim delay As Integer

Private Sub Command1_Click()
Form1.WindowState = vbMinimized
delay = Val(Text1.Text) * 60 + Val(Text1.Text)
Timer1.Enabled = True
End Sub

Private Sub Form_Load()
Timer1.Enabled = False
Timer1.Interval = 1000
Text1.Text = 59
Text3.Text = " Отдохни сученок попей кофейку"
End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)
Select Case KeyAscii
Case 8
Case 48 To 57 'цифра
If Len(Text1.Text) = 2 Then KeyAscii = 0
Case 13
If Val(Text1.Text) > 59 Then Text1.Text = "59"
Text2.SetFocus
Case Else
KeyAscii = 0
End Select
End Sub

Private Sub Text2_KeyPress(KeyAscii As Integer)
Select Case KeyAscii
Case 8
Case 48 To 57 'цифра
If Len(Text2.Text) = 2 Then KeyAscii = 0
Case 13
If Val(Text2.Text) > 59 Then Text2.Text = "59"
Text3.SetFocus
Case Else
KeyAscii = 0
End Select
End Sub

Private Sub Text3_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then Command1.SetFocus
End Sub

Private Sub Timer1_Timer()
If delay = 0 Then
Timer1.Enabled = False
MsgBox Text3.Text, vbOKOnly + vbInformation
Form1.WindowState = vbNormal
Else
delay = delay - 1
End If
End Sub