The cook times listed for the three methods are for a medium butternut squash that weighs between 2 1/4 - 2 3/4 pounds (1 - 1 1/4 kg). If you want to use a squash that is a little bit larger or smaller, you will need to adjust the cook times either up or down. I wouldn't try to go for a squash that is much larger than 3 pounds, particularly for the halved and whole squash methods. I can't say it won't work, but I just haven't tested these methods with that large of a squash so I can't say how the results will be. If you want to cook a butternut squash on the larger side using method 2 (halved butternut squash), you can also try cutting it into quarters, rather than in half, to save time on cooking. Just check the squash a few minutes earlier than listed in the recipe.