Kick Ich, No-Ich use the same chemical to kill the ich parasite in the free floating stage. It does not kill them while they are on the fish nor after they fall off the fish. You are probably looking at 4 weeks treatment after you see no more white spots on the fishes.
http://www.fishvet.com/no-ich_faqs.htm
What is the life cycle of this parasite?
The life cycle of Cryptocaryon can be conveniently divided into four basic stages. Susceptible marine fish become infected with the active free-swimming stage, called the tomite.
The free swimming tomite has less than 12 hours to find and invade a host fish otherwise it will exhaust its energy reserves and die.
If an invasion is successful, the tomite penetrates below the skin and transforms into the parasitic stage which is known as a trophont. The trophont actively feeds on the fish's tissues, twisting and rotating as it does so. It grows rapidly, doubling in size approximately every 24 hours. By 48 hours, the parasitic trophont is just visible to the naked eye, appearing as a small white spot on the fish. By the third or fourth day of infection, the trophont has attained 3 to 5 millimeters in length and about this time it exits from the fish and drops down to the substrate.
Within a few hours the trophont has firmly attached to the substrate, forming a thick walled cyst. The cyst, known as a tomont, is the reproductive stage which will eventually give rise to between 100 and 300 infective tomites, thereby completing the life cycle.
Of course, not all tomites are successful in locating and infecting a host, even under ideal conditions only about 5 - 10% succeed. Nevertheless, within a closed environment, Cryptocaryon can increase in numbers by approximately tenfold every six to eight days. This enormous reproductive potential explains the sometimes rapid build-up of infection levels in any closed system.