Remove White Hairs
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With plucking hairs, this means that you have to pull the hair out and remove the entire root, or enough of it to sufficiently damage the follicle to prevent it from being able to produce hair. This is true regardless of the pigmentation of the hair in question: black, blonde, or white (un-pigmented).
If you pluck the hair and it doesn't sufficiently damage the follicle/root then it will re-grow at the normal growth rate for your hair. The average person's hair grows at a rate of 1.25 centimeters or 0.5 inches per month, so you would probably begin to see a reemergence of the hair after about a week.
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See also:
Removing unwanted hair
Does pulling gray hairs out cause more to grow back?