I stop eating after dinner, which (depending on my work schedule) might be anywhere from 5:30-7.
I started doing this to eliminate the muchies/snacking after dinner, because it was very difficult to stop once I started. After doing this for the better part of a year now, I'm honestly not hungry after dinner and have little to no desire to snack. It helps that I have none of my old, processed snack foods in the house anymore.