Sweet Potatoes is right, you'll probably be wishing for more time not less once you get stuck into the mountain of study that's required.
The cost of having someone away from a unit at the college is very high and to minimise that cost, the courses are as compact as they realisically can be.
That said, I too, finished the procedural course in five weeks by being the only one booked on that course and believe me - I'd have prefered to be there for the full eight!
If you've got a unit that'll train you on completion of the course it's unlikely the offer will change because you can't shorten the course. Don't worry about the timings and give yourself the best chance to pass by taking all the time available to you.