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This Moroccan Slow Roasted Chicken with Preserved Lemon and Olives recipe suggests to cook a regular sized chicken for 3 hours at 325° F (160° C).

I have a largish chicken (7.5lb/3.5kg) that I want to cook. For how long should I (slow) roast this chicken for?

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That's the largest chicken I've ever heard of.

That said, 3 to 3.5 hours at 325℉ should be sufficient. Unfortunately time doesn't really matter when cooking chicken, but temperature. You should definitely be using a meat thermometer and cooking long enough for the breasts to reach 160℉ and the thighs 170℉.

If you don't have a thermometer the next best thing would be to poke the thigh when you think it's done and confirm that the juices run clear. If they are not clear, then it needs to be cooked longer.

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that's not the largest on the market. At least in the US, chickens (plucked and dressed for sale) between 2.5-4 lbs are called "fryers," between 4-6 lbs are "broilers," and 6-8 lbs are "roasters." Though I don't see too many roasters in my local megamart, Purdue and Tysons, both industrial producers of chicken, sell all three types nationwide. Larger chickens (stewing hens) are available in some local farmers' markets. – Bruce Goldstein Dec 23 '11 at 19:51
Grainfed chickens can get very large. I have one over 8lb. – user41316 Dec 3 '15 at 18:46

It will probably take more time than called for by the recipe, but not much. I would start checking at the three hour mark, then every 15-20 minutes until done.

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