Yes, that’s right. Short training sessions. Five to ten minutes.
This idea often goes against how most people think training should be - the longer the better. Actually . . . no.
Longer is not better, and often leads to confusion on the dog's part, especially if you try teaching more than one behavior in your session at a time. To prevent this, you'll want to keep your session short and productive by teaching only ONE behavior clearly and concisely.
If you add another behavior, you dilute the first to the point of it often being forgotten or only part of it being remembered, and you’ll find the second effort below your expectations.
Be clear and consistent in your efforts, only then will your dog begin to understand what you want it to do.