At 30c it speeds up the life cycled of the parasite, so at that temp the parasite should start to fall off the affected fish, i suppose at even higher it will occur quicker. However this makes it more stressfull for the fish. You can only kill the parasite during its free swiming stage. I Think it will take longer than 2 days more like 7-10 days. Read the instruction that came with the treatment, and keep dosing the treamtment however many day it states.