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.
One thing that helps to have less dye come off and less fading in the future, is after one brief rinse, to put the fabric in a hot soak with Dharma Dye Fixative or Retayne for 1/2 hour (1 oz fixative per lb. of fabric). This causes more of the Indigo to stick to the fabric.ne thing that helps to have less dye come off and less fading in the future, is after one brief rinse, to put the fabric in a hot soak with Dharma Dye Fixative or Retayne for 1/2 hour (1 oz fixative per lb. of fabric). This causes more of the Indigo to stick to the fabric.