How long time do I need to learn to ski?

This is relative. It depends what your motion culture is. If you are prepared physically and have a strong desire to ski, the time between 8 and 12 hours of lessons is enough to pass Level 2, I mean to know how to ski in all blue runs. 12 to 16 hours of lessons for red runs. 20-24 hours fot the black runs. The average length of a ski day is 2 + 2 = 4 hours.