I haven't exactly done this exactly, but this smoothie on its own holds me over for easily 4 hours.

Last year I was doing a partial fast twice a week where I'd limit myself to 600 calories on those days. I'd have this smoothie mid-morning along with black coffee and water. In the evening, I'd have a large salad of 150 calories. (It's amazing how large a salad you can make on a budget of 150 calories if you get creative. For example, I'd use kimchi in place of salad dressing. Boy did my family hate me.) Anyway, I was definitely hungry by the evening, but I would estimate no more so than if I'd had it as a meal. One thing I didn't try was splitting the smoothie in two and consuming it as breakfast and lunch.