I know I am being really dense but I can't think about this today for some reason ... last Sunday I pot-roast a 1kg bit of silverside (about 2 hours, 2 1/2 hours I think) and it was perfect. I've got people coming today but couldn't get a big bit so I have two pieces, each about 1kg, which I am going to put in the pot together. I know pot roasting is more forgiving than normal roasting but I just can't figure out whether I do it for the same amount of time or give it a bit longer? Help!