All cooking times will vary depending on the size of the joint and – more importantly, how you like your meat. However, the following are some approximate times:
Rare 15 minutes per lb / 33 minutes per kilo
Medium 20 minutes per pound / 44 minutes per kilo
Well done 25 minutes per pound / 55 minutes per kilo
Other factors that will affect BBQ cooking times are weather, the amount of charcoal that you are burning and the cooking height above the coals.