I don’t know how long, a scientist would say, chicken can be in the fridge. However, and this I learned the hard and smelly way, I’ve noticed chicken can stay in the fridge for 3-4 days. It totally depends on the temperature of your refrigerator and your house. I think it can only go up to 4days if its still a little frozen, but if it’s completely thawed, I suggest you cook it as soon as possible or at least the next day. I learned this the hard way over this summer.