Please take note that 12 months replacement period is a maximum period you can use. After you opened the lenses, it depends on the frequency you used.
It's wear and tear product, the more frequent you use, you shall dispose it in shorter period time frame. The longest you can use is 12 months. Says you used it every day, then we advise you to dispose it within 3 months.
For more information Return & Exchange, please visit here.