I done my cbt 9 years ago and it's a full day job normally, in the morning it's usually on a school yard or similair round cones that dort of thing.

Then on the afternoon it's out on the road with the instructor and another learner normally.

then that's it, it's not pass/fail. It's only there to show you can follow instruction and can handle the machine.

Then you can learn on the road with an instructor (also at this stage you can ride a 50cc with L plates on)

My instructor took me out on a 250cc for the first 3 lessons then I jumped on the 400cc (which is big enough to pass the direct access)

Then I had 9 lessons and passed test 1st time. Dead simple.....

As long as your safe on the road and can handle the machine you will be fine.

once you've passed you can go out and buy a Hayabusa or R1 if you want but be prepared for silly insurance quotes.

I bought an R6 brand new 2 weeks after passing my test and was very impressed with it. It was far far lighter and much easier to handle than the bike I passed my test on.

I would say go for it, 600cc is more than enough.....

I traded my R6 for an R1 and would say overall I prefered the experience of the R6.....

Good luck!