Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Private Sub Command1_Click()
delay 3000, "a", "a"
End Sub
Sub delay(ByVal interval As Long, ByVal str1 As String, ByVal str2 As String)
If str1 = str2 Then
Exit Sub
Else
Sleep interval
End If
End Sub