It is very important to use the wet/dry cycle so that you can "see" exactly how much water your plant is using. The reason this is so extremely important in an Auto is that about a week into the grow, an Auto will stall all on its own. If you continue to water, not recognizing the stall, you can quickly harm your plant, and as we all have heard, if you upset an Auto in the very least she will stunt out.
Please read my watering article found below in my signature lines and become familiar with the concept of letting that cup go dry all the way to the bottom between waterings, and how to recognize that it has done so. By measuring the days between fully wet to fully dry, you will "see" your roots and how fast they are sucking up that water.
So the first task is to not water so much that you lose sight of the water cycle. The days between watering will start out around 5-6 days if you are doing this right, but those quickly growing Auto roots will seek out every bit of water that is in that cup, and on the second round they will only go 3-4 days before needing another drink unless you are in the stalling out period, and then that next watering might take 7-10 days before it is needed. Be patient. If you recognize when the plant has started using up water again and give her water at the end of that long drought when she is fully dry down to the bottom, she will leap into action. Because you are forcing the plant to grow new roots between waterings the next watering may be 2-3 days away if all is going right and after that next watering you need to think about transplanting, because when she needs water again in just a day or two, it will be the perfect time to transplant her. The buffer that keeps you from having to water every day, your soil, has just reached is point of diminishing returns and it is time to put her in the next sized container. With Autos as fast as they move, it is usually ok to go to your final right out of the solo cup... that is, if you can see from your wet/dry cycle that she has indeed earned the roots necessary to move on.