This is always a big question people have. Once you're done sous viding, if you cook it through to pasteurization and you chill it efficiently and then put it in a refrigerator, the food will last for a long time, a lot longer than normal leftovers do.
If you follow that routine, cooked food in unopened sealed bags will last for at least a week, if not longer. I know some people, I think Douglas Baldwin is one who talks about food lasting for 2, 3 or even 4 weeks, depending on if your refrigerator's cold enough and you've chilled it properly. So sous vide leftovers do last for a long time.