How long does it take to get hydrocodone out of your system, what is the fastest way?

There is no "fastest way". Only time will do the trick and not doing any more.

Depends on the usage, and the type of test being used, urine, blood, hair.

There is no fast way, only time

The dr gave me hydrocodone 3months ago and my back is hurting is OK to take then or has is ben to long ago

I would think the shelf life is longer than 3 months. To be sure you might want to check with the issuing pharmacy.

Seriously? Check the expiration date on the bottle... use your brain