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1 Place in a metal loaf pan (if using a large crock pot) or directly in crock pot. 2  Place the loaf pan directly in the crock pot if using a loaf pan. 3  Put the lid on crock pot and cook on low (6-8 hours) or high (4 hours). 4  If not using the loaf pan, it will cook faster, so check in 3-4 hours on low or 2-3 hours on high. Put the lid on crock pot and cook on low (6-8 hours) or high (4 hours). 2  If not using the loaf pan, it will cook faster, so check in 3-4 hours on low or 2-3 hours on high. 3  When cooked, turn the crock pot off and let cool for 15-30 minutes with lid off before cutting.
Set your Crock Pot on high to reach a simmer point of 209 degrees F in 3 to 4 hours, or low to reach the same cooking temperature in 7 to 8 hours. The total time it takes to cook an arm roast depends on its size. A 3- to 4-lb. chuck roast takes 5 to 6 hours on high and 10 to 12 hours on low.Chuck roasts usually contain enough marbled fat to cook without water, but most Crock-Pot roast recipes call for a little liquid.Most importantly, resist the temptation to lift the lid while your roast is cooking. 3- to 4-lb. chuck roast takes 5 to 6 hours on high and 10 to 12 hours on low. Chuck roasts usually contain enough marbled fat to cook without water, but most Crock-Pot roast recipes call for a little liquid. Most importantly, resist the temptation to lift the lid while your roast is cooking.