If it was already thawed out, then I wouldn't leave it in there more than 3 days. If you thaw it out while in the frig, you might be able to get away with 4. Hope this helps.
I would say cook it within two days after thawing it. The sooner the better especially if it is in the summer because the refrigerator is opened more often. Check out my new cookbook on lulu.com “Make You Want To Smack Your…Lips for more helpful hints. Take care