well, there are several factors that might make that difficult to answer. For instance if you are using a standard, frost free, properly working refrigerator then is should be cycling regularly meaning it is circulating the air. Also if this is your kitchen refrig then the door is being opened and closed several times also meaning a turnover of air inside. If instead this is a 2nd refrig that is seldom opened or a compact unit then the air can become stale and an odor could become noticeable several days in the future. OTOH even after I have aged meat 45 and 60 days I do not detect an odor – unless I have become so accustomed to it, I suppose. Typically you will notice the earthy/nutty smell after you remove the UMAi Dry bag. Here it is day 4 and if you are still smelling a funky odor I think your meat may have an issue and I still think you should be consider returning it!