The first patients to be treated with Fraxel re:pair prototype in the clinical trials are now about 3 years out from their treatments. So the answer to your question is at least 3 years. From our experience in the past 18 years with traditional carbon dioxide lasers, it is thought that the current fractionated carbon dioxide Fraxel repair laser treatment will last from 8 to 10 years.
The results will vary from individual to individual, and also will be dependent upon the aggressiveness of the treatment. Although aging does continue, the patients should always look a few years younger than their actual age than they would have if they did not have the treatment. The treatment just tightens the skin and makes you look healthy and rested and younger. A nice aspect of the treatment is that it can be repeated as necessary over the years with additional benefits.
So ask me again in ten years for the definitive answer. For now it is at the forefront of non-invasive facial rejuvenation with fractionated CO2 lasers. You will be seeing and hearing about many new lasers in the next few years as laser companies follow Reliant and Lumenis into this leading edge technology.