look at the experation date, if its in the jar in the fridge it should last about 2-3 months. if its on a sandwich it should last a few hours, depending on how cool it is.In my opinion mayo can not...
Sushi (the seasoned rice mixture) itself can last for a few days before it's overall quality is diminished. However, sushi in the sense of raw fish with said rice and other ingredients is supposed to...