All submarines are limited solely by the amount of food onboard. Toward the end of a deployment, the meals get interesting (chili mac with a side of canned beets, for example). The longest that I've been submerged was about four months, followed by two quick port visits, followed by two months at sea.
A smart TV, sometimes referred to as connected TV or hybrid TV, is a television set or set-top box with integrated Internet and interactive Web 2.0 features. Smart TV is a technological convergence between computers and flatscreen television sets and set-top boxes.
On a normal TV, you can just watch TV, but in some TVs like(LCD, LED, OLED), you can watch TV along with connect your USB drive for accessing movies, videos, music and pictures etc. On a Smart TV, you can find all normal TV features along with the internet browsing features.