“This completely depends on what your specific goals are, and how often you practice. Serious students take private lessons for years. If you are a complete beginner the first month or two may be a bit challenging.
Music is often compared to learning a second language. At first everything may seem very foreign to you. As you progress (and if you make it past the “two month hump”) things will start coming easier to you and you will find that lessons are less challenging then they were before.”