Well, generally speaking, the more years you do, the more cost-effective. For example, 1, in 2004, it will only cost more than 5,000.
But my suggestion is that it will take about 1 to two years. When you get the card, they will recommend you a coach, and you can refuse.
You can ask a private tutor, and the price is relatively expensive. A class is basically above 250. If you want to ask, I suggest you give a plan 4-8 times.
After all, it's too much trouble to get familiar with the common equipment one by one.