If we go by SGI practice law for a new drivers, then it is recommended that a new driver should practice at least a minimum of 36 hours behind the wheels (of course with brakes) . If I talk practically then the number of lessons an individual require to learn driving completely depends upon how much or how little effort he or she is willing to put. You need practice, the more you do, the more you will get better. So each lesson with the class 5 instructor makes you better. You can practice same with your own vehicle as much as you can.