The cornish x meat bird is what you'll have to get if you want a bird similar to the store. With "dual types" you'll have a skinny bird no matter what. Any older and they'll be tougher. Age at least a day.
About cooking and eating meat... here in the US we are always told refrigerate, refrigerate, and refrigerate... but my mom leaves whole chickens fixed up for the oven sitting out 3-4 hours at room temp before going in, and we're still alive. Our thanksgiving turkey and freshly butchered birds often spend half a day just sitting out on the counter open to the air. She says when she was young, they'd just hang raw meat from the market overnight in a door way from a string so cat's wouldn't steal it and they'd still cook it and eat it. After cooking meals, they just brought to boil/finish what ever was being eaten and did not open the lid before re cooking the next day. They didn't have a fridge where they lived since electricity was often spotty.
About cooking and eating meat... here in the US we are always told refrigerate, refrigerate, and refrigerate... but my mom leaves whole chickens fixed up for the oven sitting out 3-4 hours at room temp before going in, and we're still alive. Our thanksgiving turkey and freshly butchered birds often spend half a day just sitting out on the counter open to the air. She says when she was young, they'd just hang raw meat from the market overnight in a door way from a string so cat's wouldn't steal it and they'd still cook it and eat it. After cooking meals, they just brought to boil/finish what ever was being eaten and did not open the lid before re cooking the next day. They didn't have a fridge where they lived since electricity was often spotty.