When should I expect final result after Silikon 1000 lip augmentation? (photos)

I've had 2 Silikon 1000 lip treatments spaced 4 weeks apart. The second was 17 Feb 16. So far, I'm very pleased with my results. I've read that the silikon triggers my body to produce collagen which aids in filling in the area. How long after a treatment should I expect to see the full result? They recommend follow up treatments be spaced 4 weeks apart. Can I expect to see much change after 4 weeks?