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.
Answers. Best Answer: Well, it depends what kind of dye you use. If the dye you are referring to is the semi-permanent kind available in boxes from the drugstore, you should be good about 2 weeks after you do the lice treatment.