How long will I have to wear my retainers?

I have had my retainer for a while now. I got it on my last orthodontics visit, but I have not got around for another appointment yet. I asked the orthodontist how long I will have to wear my top and bottom retainer (which is glued to my teeth). She said the top one I have to wear for the rest of high school, and the bottom one for as long as I can. I really hope that isn't right! Can I get some help from someone who has had a retainer? Thanks!