Pasta producers have developed no-boil (oven-ready) dried lasagna sheets to reduce prep time. These are thinner than regular dried lasagna and have been pre-cooked and dehydrated. This means that if used to make slow cooker lasagna, the texture will be softer, not as sturdy, and cook much quicker. I recommend cooking for 1 1/2 to 2 hours. Add more time as needed to tenderize the noodles.