try to set up your fridge so you can hang it,,, will last for a month. Brain tends to go off for me in a much shorter time. With fat, it's a different story. It will oxidize, and I'm lucky enough to get shipments every couple of weeks. They come in vacuum sealed bags which I open just before using. I used to try opening them all and hanging too, but I think they oxidize and develop an unpleasant taste in the mouth.