30 years old- nd:YAG laser for under eye veins, how long do the results usually last?

Hello, I am a 30 yr. old female who has had some blue and smaller red veins under my eyes for a few years. I had a consult to have them removed with a nd:YAG laser and the esthetician informed me that that the results wouldn't be permanent and that the veins would most likely come back within a year. This is the first I have heard of them coming back in such a short amount of time. Is this true and if not how long do the results usually last? Thank you!