I made this over a year ago and it is THE BEST EVER Beef Stock. After roasting the bones I slow cooked them in two crockpots (I had a lot of bones) all day and night. Then I ladled in to ice cube trays and froze. I used those cubes all year long in anything and everything that called for beef broth/stock so I can tell you from experience they will last longer than a few months and the flavor of the stock elevated even the simplest of dishes to something extraordinary. I just recently used my last cubes and plan on making it again soon. This has really become one of my favorite "secret ingredients" in beef dishes and is a Must Try.