Orange Juice - 3 days. Left unrefridgerated for a week.
World of Warcraft - 4 more days.
Aion - 30 days.
Do you know what expired orange juice looks like? I do now, and I made the ultimate sacrifice so you don't have to find out. Expired Orange Juice smell and taste the same. The only difference I was able to notice about the juice at its level of decay is that the colour looks darker... Drinking the juice did not instantly make me sick. There was just a slight ache in my stomach, so I didn't think much about the juice.
A couple days later, I once again reached out for more orangy goodness. This time, while swirling the container, I noticed that there was a sort of milky substance swimming inside the juice. Once again, it tasted fine. I took extra care to not drink the bottom gunk of the juice where it looked too questionable for me to drink. The next day, I wasn't able to go to school.