8 to 9 hours translates to 2.5hrs at pressure from http://www.bbc.co.uk/dna/h2g2/A660836
1 imperial cup = 10 fluid oz = 284 ml
Roast Chicken
Heat oven to 190C/fan 170C/gas 5.
Roast for 20 minutes per lb (450 g) plus 10-20 minutes extra
Roasting
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