There is no easy answer to how many hours you will need!

According to the DVSA, it takes an average of 45 hours of professional tuition plus an extra 22 hours of private practice with friends/family members.

I will not let you take a test in my car if I feel you are not ready, and I will happily refund you if you are ready and don't need all the lessons you have paid for!

The table below is from UK National Data and shows the driving lesson hours to reach test standard - use it as a guide.