How long does it take for apprentices of Oriental rotary drilling rigs to learn?
The speed of learning X-digger is closely related to one's sexual orientation. Generally, we learn by training and learning from teachers. You can master the basic knowledge in about three months.
Every skill has been learned, but some are more difficult and some are easier to learn. It depends on whether you are very interested in this thing. If you are interested, you will study very hard.