Haha those cars are extremely fast, that should satisfy your curiosity. To gain some perspective, in CART they are V8 turbo charged and Paul Tracey the driver for the Kool team was doing 250mph on the oval, that was while he was drafting though so on it's own power I suspect it may take him longer to get up there, just needs enough run away.
F1's are equipped with V10's Natural Aspirated, but I'm willing to bet it's able to do mid 200's mph as well. These are insane machines... and yes, I would bid 10.1 years off my life for a few laps.. and finally yes, I won't even be able to start the car

I dont' drive manuel well, and these cars are really hard to maneuver as I understand it.
Those are fast..damn.
It's also worth noting that the McLaren F1 did an onofficial 243mph.