How dense is the traffic?
How competent is the driver?
How brave is the driver?
Full lap or BTG?
TF or dedicated track day?
Are the back seats up or down?
Sub 9 mins is respectable, I guess a Subine Smitchz or F1 driver could push the 8 mins mark, my loose timings had me do it in 8:20-8:23 on the Btg with my old engine. At the time I had plenium, inlet, air intake and exhaust mods, along with my current upgraded brakes.
Iirc it was pushing out around 190bhp so not exactly stock, but will give you an estimate.