There are a lot of variables in bread making. An hour is probably an average. You can speed the time by putting the dough in a very low temp oven, or setting the pan it is in over a pot of lightly steaming water. Use a wire rack across the top of the water pan. A single batch of dough can be forced to rise in 20 to 30 minutes. Generally, the faster the dough rises the coarser the end product is going to be.
I assume you are talking about the activation process where you heat water and add your yeast and sugar. This usually takes 5 minutes if it is fresh... make sure to store in your refridge and your yeast will last longer than expiration date.
First time or second time? What kind of flour? Quick yeast or normal?
A good starting point would be an hour. Many breads take longer.
The time needed for yeast dough to rise depends on the type of dough and the temperature of the environment.
1 hr
Hours
Yes, if yeast dough is left to rise too long, the yeast will consume all of the available sugars. Then the dough will not be able to rise when baking, resulting in a heavy, tough product.
The yeast cells in bread dough ferment sugars and produce gas (carbon dioxide). This makes the dough rise.
The yeast consumes the natural sugars in the dough and causes bubbles to form. This causes the dough to rise. It's being blown up by the yeast.
The leveling agents such as baking powder/soda in quick breads and in normal breads, the yeast 2nd answer: That should be 'leavening agents'.
Yeast makes the crust rise.
It is because of the yeast.
With yeast, one of yeasts main point is to make dough rise.
Your bread dough will rise then fall on the second rise if you allow it to sit too long. When left to rise too long, the yeast will consume all of the available sugar in the dough, resulting in fallen bread dough.
Yeast dough is dough (basically a mixture of flour, water, salt) to which yeast (a form of fungi) has been added to cause the dough to 'rise', add in dimension by filling the dough with carbon dioxide given off by the yeast. Dough without yeast does not expand.
To allow the dough to rise so you get a lighter, less dense end product.
Yeast.
It makes dough rise.