I ate sushi 3 times in the last 4 days, while traveling for work. This is what I had:
Day 1 - Seaweed Salad, 1 spicy tuna roll (8 pieces) and 1 crab salad/avocado roll (6 large pieces). The last few pieces I had to start eating the fish out of the middle and leaving the rice as I was STUFFED!
Day 3 - Seaweed Salad, 1 spicy tuna roll (8 pieces) and 2 unagi sushi pieces. This was a perfect amount.
Day 4 - I went to a sushi 'boat' place, where the rolls are mainly 4 pieces per plate, and the sushi pieces are 2 pieces per plate. I had: Spicy Tuna roll (do you see a trend here. LOL), unagi sushi, Yellowtail/Avocado roll and an Inferno roll. At this point, I was debating grabbing another plate, as it seems most people around me had 6 or more plates piling up, but I was getting a bit 'sushi'ed out' by this point and was adequately stuffed.