From eat.shop.seattle, pg 11:

“In the world of blogs I discovered a formula for eating “conveyor belt” sushi in tokyo: ‘Eat at least seven plates. For sevent to ten plates, please take twenty minutes. For more than ten plates you may take up to thirty minutes.’ This blogger has never seen me in action at Blue C Sushi. I could go through ten plates in ten minutes flat, and that includes picking up every last spare piece of rice with my chopsticks and wiping my mouth. I love the sushi here: it’s fresh, it’s fast and the conveyor belt makes me happy.”