How long does it take to learn sheet metal bending?

Bending is actually very simple. I didn't know anything about bending before, but now I know something. If you learn math well, there is no problem, and you don't need to learn it at all. For example, the bending machine itself has a signboard and a bending pressure gauge. If there is no lower die, the formula is 1-3 mm, the plate is 6-8 times, and 3-8 mm is 8- 10 times. If you look at the drawings carefully, you will know the bending order. I am now the head of a sheet metal department in an enterprise, and I usually like to communicate. If you still want to know about sheet metal, I am willing to help you as much as I can! QQ:59 1 143589