can ick appear overnight?

[jiggy]

how long before i see signs of ick in other fish once a fish with ick is introduced?

 

[arizona tech]

sure it can overnight,a few hours, the other fish could become affected the same day or a few days later, or months to me the tank is now diseased

 

[jiggy]

the spots can appear overnight?.. i thought it took a few days for them to develop