I kept my little girl in a puppy cut until she was about a year old, then started growing it out. It really didn't come into its own untill she was about 2 1/2 to three years old. It was still changing. If you brush daily, you shouldn't have a problem
I only spend about 5-10 minutes a day on each of mine in long coats, if I were to skip a few days, that time is increases
on at least one of them