Neptune's years are 164.8 Earth years. Its days are 16 hours and 6.7 minutes long. Although Neptune's days are shorter than our days, its years are still longer than ours.
Most colorants will last in your pond approximately 30 days. You may have to add more pond dye before 30 days if you have execissive rainfall, run-off, a heavy out flow, or evaporation. If your colorant is fading you will visually be able to tell and should add more dye to the water.
By Braden Galbreath-O'Leary Submitted On July 01, 2009. Pond turnover is a phenomenon that would go largely unnoticed if it weren't for the sometimes awful consequences. Mild turnover can leave your water cloudy for a couple days. Severe turnover can kill thousands of fish, and leave your property smelling like a month-old rotting egg.