How long does it take to train a guide dog?

Puppy - A black puppy retriever, who looks like hes waiting to play.
March 8, 2007 4:48pm CST
Always wondered this, and I've also wondered how long it takes someone to train a hearing dog for the deaf. I would imagine a year, but they must have examination they do and maybe retested at a later date. Anyone know, or have you trained dogs like this?
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