I eat sushi several times a month. I do not eat the raw version of the fish, but I do eat sushi rolls.
It depends on what kind of rolls I choose. If it's just the veggie rolls with carrots, cucumber, avocado and cream cheese, I can eat about 4 small pieces. If the rolls are the "fried" version with crab meat and some veggies, I can typically only get in 2-3 pieces. I have to eat super slow, like 30-40 minutes to get those in.
We go out for Hibachi once or twice a month, and we split a fried crab sushi roll, and then we get the shared order of filet mignon/chicken/fried rices/veggies. I eat the sushi pieces wait while the Hibachi guy is doing his little show then I sip some plum wine, and I eat a few bites of steak/chicken, watch a little more of the show, and then eat some fried rice. It's one of the few occasions when I sip while eating. This dining experience lasts nearly 2 hours and that is the only possible way I can get in that much food.