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1 For a medium rare roast: Cook the roast for 20 minutes for every pound. 2  If you were cooking a 5 pound roast, you would cook it for 100 minutes. 3  For a medium roast: Allow 22 minutes of cooking time for every pound.
It's slow! Slow cooking roast beef can take 4 to 8 hours depending on the size of your roast and how cooked you like it. It also generally won't give a nice brown crust around on the outside of the roast. The temperature just isn't hot enough to brown the meat. This can take 4 to 8 hours. 2  It depends on the size of the roast and how done you like it. 3  Remove it from the oven, and let it stand for 20 minutes. 4  The temperature will keep going up while it stands, so it actually finishes cooking outside the oven.