When I train anything, I always take short breaks for the dog to process. Wolfy likes to work then take a short break. If we spend maybe 40-60 minutes in an area, he works maybe 3-5 mins work, then a little break then working again. I found if I kept asking to find another truffle, without a break he is not as enthusiastic. Also, when I teach, a one hour class, no matter what we train, 2-3 minutes of training then a short break works best. His short break consists of him squishing his ball, and maybe lying down or doing nothing much. After maybe a minute, I trade his ball with a treat, and cue him to work again.
You could call that his reward, just squishing the ball, but that is what he likes.
