It takes breast implants 3 days to "drop and settle" into their final position after a breast augmentation surgery. However, even right after surgery, you will look and feel a significant improvement in size, contour, and shape of the breasts.
It is normal and expected for your implants to feel "high" and "tight" immediately after surgery. Starting just 1-2 days after your breast augmentation, they will already be feeling softer and more natural.
There are many examples of breast augmentation results from my New York City patients elsewhere on this page, but here I have included images of a few patients at various different time points after surgery to give my patients a better understanding of what to expect over time.