I got used to them right away, Under normal conditions you can get used to them at most a day or two. If you are finding it hard to get used to your progressive lenses, they weren't made correctly or the frames may have to be adjusted, Progressives are very sensitive to the shape of the glasses around your face and how far the lens is from the eye,if you go for months feeling dizzy,Having headaches, squinting in order to be able to see, you may have to get another pair.