There actually isn't any specific time frame. It all depends on the conditions under which it has been stored before and after sale and the size of the bacterial load.
If you are referring to refrigerated fresh tuna, plan to use it within 1-2 days of purchase.
See this site from Clemson University Cooperative Extension Service:
http://hgic.clemson.edu/factsheets/HGIC3522.htm
No, overnight is too long to leave the uncooked roast out. After all, the uncooked roast is essentially decaying flesh of a dead animal. There's no telling what insects might come in contact with the meat and lay eggs.
It shouldn't be left on the counter. It should be marinating while refrigerated.
Until it uncooks or recooks into the cooked cooker, but if you uncook or recook, make sure the cook is cooked, you cook. Recooking involves cooking the uncooked cook, or recooking the recooked uncooked.
If its uncooked than how is it scrambled?????
1. Fully cooked - Yes2. Uncooked and never previously frozen - Yes3. Uncooked and thawed, kept in fridge for 3 days and re-frozen - NoNever freeze, thaw, and re-freeze uncooked poultry.
I would not eat it after it has been siting for 1 maybe two hours
About 4 to 5 days
if it is sealed tight a couple days at most. Cook it as soon as possible though
Not past 10pm.
vegtables
uncooked hams that have been frozen last 6 months or longer.
I would think 7 days would be too long. I usually throw it out after 3-4.