For best results, place your bottle in direct sunlight for around 30 minutes to help it charge the most effective way to activate the glow. Indoor light can work too, but results may be softer. Glow tip! To get that all-over glow, give your bottle a little spin while its charging any spots left in the shade might miss the magic. Psst - don't forget to flip up that lid. The glow shines brightest for around 30 minutes, then gradually softens into an afterglow that lasts for hours and hours. Our bottles, lids and sippers are made from different materials and just like our colours, they each glow with their own unique strength. Thats part of the charm.