Treat them like you would treat tuna. They're pretty salty, so they might last an evening on the counter. But you should try to keep them cool.
Anchovies packed in oil should be good for 3 to 4 weeks. Even longer if they are packed in salt.
no
Yes you will need to refrigerate after opening, but it doesn't need to be refrigerated if still sealed.
AnswerOnly after they have been open.You don't need to refrigerate brined olives as long as you keep them immersed. However marinaded ones should be kept refrigerated.
No, it does not.
Yes.
Yes. It really should have been refrigerated before opening, too.
doe
It may not have to be refrigerated after opening - but it will probably retain it's moisture and flavor better if it is. If the bag recommends refrigerating after opening, then do so.
Yes. Homemade marinade should be refrigerated, and purchased marinade should be refrigerated after opening.
Yes. Homemade marinade should be refrigerated, and purchased marinade should be refrigerated after opening.
Yes, generally hummus is sold as a fresh food.
I would suggest you refrigerate the opened container. If it was in the refrigerated section when you bought it, keep it refrigerated. If it was not in the refrigerated section, check the label for instructions like "refrigerate after opening". Absent those instructions, refrigeration would probably help protect flavor even if food safety might not be an issue.