The number of driving lessons required are very individual and are based on your past experience, skill level and how much you practice drive privately.
In addition to the number of driving lessons that enable you to develop to the sufficient level, you will need to participate in the mandatory classes and lessons, as required by Norwegian law.
More information about these requirements can be found here.
In the first lesson, you and your teacher will agree upon a progam or number of driving lessons to fit your needs.