The amount of instant dry yeast needed to make 1 kg of flour rise in an hour can vary depending on the recipe and the desired level of leavening. Generally, for a standard bread dough, the typical range of yeast to flour ratio is between 1% to 2% by weight. However, it's important to note that instant yeast is highly efficient and can produce quick rise times.
For a moderate rise in one hour, you can use around 1.5% instant dry yeast to the weight of the flour. Here's the calculation:
1 kg of flour x 1.5% (0.015) = 15 grams of instant dry yeast.
So, you would need approximately 15 grams of instant dry yeast to make 1 kg of flour rise in about an hour. Keep in mind that other factors like the dough's hydration level, ambient temperature, and dough handling techniques can also influence the rise time. Adjust the amount of yeast as needed based on your specific recipe and desired results.