How many driving lessons will I need?

Right, so I've had two one hour lessons. The first lesson I grasped biting point and gear changing instantly. So my instructor let me drive into town on my first lesson, including going onto a roundabout (taking the first exit though), and on my second lesson I drove to a town about 5 miles away including other towns along the way, and back, including going round two roundabouts. He then said for my third lesson I'd be doing maneuvers (reversing round a corner and doing parallel parking). How many lessons do you think it will take before I'm ready to take my test?