I am preparing to roast 9 lbs of pork loin (Dorie Greenspan's recipe for chard-stuffed pork roast). However, I have three 3 lb roasts. I am aware that 20-25 minutes per pound is a usual amount to cook a pork loin, BUT, when I cook three 3 lb roasts, it must not take as long as it would to cook one 9 lb roast?? Or, does it? Please help so I know when I should get these roasts in the oven. This is not urgent yet, but it is going to be on Sunday when I must get them started before our midday "Christmas at the Farm".