I've got a 5.75 lb bone-in leg of lamb. I want to do a simple roast, rubbing it in a mix of olive oil, garlic, oregano and maybe some thyme/rosemary. I want to cook it at a low temperature (200?) to 130 degrees. Anyone have an estimate on how long it will take? I know to pay attention to the temp, not the time, but I want to have dinner ready around 5, so I want a good idea as to when to put it into the oven. Thanks!