The amount of training you will require depends on lots of factors Age, Aptitude, Commitment to name but a few.
Generally, 30 or 36 hours intensive training is fine for a complete novice. However, 42 or 48 hours may well be needed for a complete novice who does not take naturally to driving.
Intensive Courses aren't for everyone. It takes a great deal of concentration to learn to drive and even a five day course can be extremely demanding.
Semi-Intensive Courses offer an easier alternative to the traditional Intensive Course.