Not more than two hours. After two hours, it must be refrigerated at or below 40 degrees Fahrenheit. Otherwise, it will perish and should be discarded. Sushi salmon roll 
Can I consume sushi left out for 24 hours?
– Sushi is a popular Japanese dish that is typically made with raw and cooked seafood, vegetables, rice seasoned with vinegar, and dried seaweed ( nori ). It is more likely to contain parasites and bacteria and must be stored properly to reduce the risk of foodborne illness.
Can I consume sushi that has not been refrigerated?
Raw Sushi – The type of sushi we encounter most frequently is raw sushi. It consists of sushi, rice, and raw seafood toppings such as fish, shrimp, eel, crab, etc. These raw seafood varieties can be stored at room temperature for up to two hours. If you do not intend to consume them within two hours, please refrigerate them for up to twenty-four hours.