When fillers are correctly injected into this area you should see results before leaving the doctors office. You might have a little swelling that will change the picture a bit but should be able to see a good correction right away. If a skilled dermatologist is doing this you might want a filler that is a bit more substantial for this area, like Radiesse. However, this must be injected carefully as it is not reversible, although is not permanent.
Web reference: http://brookwooddermatology.com