How long does it take to become a pet trainer?

Heres how it works for guide dogs. When a puppy is born and can be taken away from its mother it goes to a guide dog center. It will meet its puppy raiser. The puppy raiser raises the dog until its one and a half.A walk will be great so the puppy raiser will get to know the dog. I should mention that only German shepareds labs and retrevers can be a guide dog.any way when the puppy is almost two it will have to say goodbye.I know its hard saying bye to a friend. That's one of the hard parts saying bye.Then it goes to a guide dog trainer.The trainer has to be strict.When a dog does something right the trainer says good girl or gives the dog a treat.Then when its almost done they learn to cross a street. That's very important to learn. Then when the dogs trained it will get a owner. A guide dog retires at ten but still will have a owner.