A great way to save time while editing in Lightroom is to use the previous button. This button, located in the lower right part of the Develop Module screen, can speed up your workflow quite a bit as you work your way through your images.
Once you make settings to an image, use the filmstrip on the bottom of the screen to access another like image. Then hit the Previous Button. All of your settings used on the last image will be automatically assigned to that new image. Be aware, that if you don't make any setting on an image selected in Lightroom and move to a new image, the Previous Button won't apply any changes.
Here is a quick video on how to use the Previous Button in Lightroom.