Vista - UAC Timeout ?!?

I start a process per:

ProcessStartInfo si = new ProcessStartInfo("Task.exe");
si.Verb = "runas";
Process p = Process.Start(si);

On Execution the UAC dialog will be displayed.
If the user selects nothing for two minutes, this dialog will be closed.
The win32exception error code is -2147467259 on this timeout AND on user
“cancel� selection.

Is the any way to know -> what is happened (cancel or timeout)?
Or could I disable this timeout anyway?

Sven K <kuehne@xxxxxx(donotspam)>'s wild thoughts were
released on Mon, 22 Sep 2008 05:56:02 -0700 bearing the
following fruit:
I'm curious to know why it matters, surely its all the same
to your program?

--
Jan Hyde (VB MVP)

https://mvp.support.microsoft.com/profile/Jan.Hyde

Its a usabillity issue for me.
I would not like to cancel my process on a 2 minutes timout.

I get a workaround by support. It is simple, not very nice but works for me.

I have to check the time from process start till exception. If time is less
then 120s it is a user abort else it is an timeout.