After several hours, the dough will have changed completely.
The time it takes for the dough to rise depends on your room temperature. A warmer environment means a shorter fermentation (or rising) period. If your room is cooler, the dough will still rise, but it will take longer to do so. I’ve had a rising time of as little as 3 hours, or as long as 7 hours. Know, however, that faster does not mean better. The longer it takes for the dough to rise, the more time it has to ferment which means the more flavor it will have. After several hours, the dough will have changed completely. It should have a smoother surface and feel very light and airy.