How long does it take to cook 2kg beef?

Chef's answer
Bring the beef out of the fridge 1 hr before roasting.) Heat oven to 190C/170C fan/gas 5 and sit the joint in a snug-ish roasting tin. Roast for 12 mins per 450g/1lb (about 55 mins for a 2kg/4lb 8oz joint) for medium-rare, or 15 mins per 450g/1lb (about 1 hr 10 mins) for medium-well..
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