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.
How long can you leave in demi permanent hair dye? I know for semi permanent hair dye you can leave it in for hours because there is no peroxide, ammonia, etc. But for demi permanent hair dye it does have a small amount of chemicals, so i was wondering how long you could leave it in with minimum hair damage. Thanks for answering. Follow.