My female mouthed for a couple weeks and was done at about 3.5 months. My male was mouthy when I got him from the shelter, he was about 8 months. It took about a week for him to stop. I used redirection for both.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD