If the sandwich has food on it that can spoil then it should be refrigerated. If it is refrigerated then it should be good. Some things like tuna salad sandwiches will make the bread soggy if left for too long.
This depends on how old your sandwich was when you bought it, whether or not it was refrigerated, and several other factors. When in doubt, don't eat it!
A foot long submarine sandwich is 0.000189393939 miles long.
3 to 4 days refrigerated
About four to five days, properly refrigerated.
about a week
It won't make a difference, it will just be colder, if pellet [not refrigerated] 24hours, if flakes [not refrigerated] 20mins.
Either in a container covered with a lid or plastic wrap, or in a sandwich bag.
You can keep brown eggs refrigerated for at least 2-4 days.
If you plan to use the leftovers, it should be refrigerated within 2 hours.
24 hours
They should be refrigerated or frozen if you want them to keep. Generally you should probably eat them within the day if they aren't being refrigerated so long as the weather isn't too warm.