I typically do several warmup sets - 135, 185, 225, 275... I start counting at 315, then do several sets in the 365-425 range... At least 6 reps, as many as 10 reps if stopping at 365.
I will usually finish by stripping 90 pounds off the bar after my last heavy set, then grind out at least 12-15 reps - maybe 20 reps if I'm up to it.
From there, it's several sets each of machine squats, leg presses, and hack squats. I try to keep it to under an hour.