Pulled right from their website's FAQ section.
http://www.nightandday.com/
Are NIGHT & DAY contact lenses OK to wear for up to 30 nights?
While individual wearing times may differ, both our clinical research and market experiences have shown that NIGHT & DAY breathable contact lenses can be worn for up to 30 continuous nights and days. The FDA has approved NIGHT & DAY for daily wear and extended wear for up to 30 continuous nights. Several million patients have worn NIGHT & DAY contact lenses worldwide with great success.
The benefits of NIGHT & DAY contacts include the highest oxygen transmissibility of any available soft contact lens for the health of your eyes, a surface treatment that helps to minimize deposit build-up and produces a highly wettable lens, which helps the contacts move well on the eye and enhances comfort. All of these factors help in the ability to wear NIGHT & DAY breathable contact lenses for up to 30 nights. Please follow your eye care practitioner's recommendation on wearing time.
I
am following the directions and doing better than the directions.