Third Party Testing Process

My product needs third party testing for dietary supplement compliance. We sell pure creatine monohydrate, made and packaged in the USA, and have no concerns about purity. I’m really worried the third party tester will say the label isn’t ok for one reason or another (for example, the font here or there is too small). We’ve been successfully selling for almost 3 years and a lot of inventory is at stake.

Had anyone here gone through this testing process for their dietary supplement? Does it take a long time to get approval? If it doesn’t get approved, then what? The tester we’re using is Cotecna.