How long does it take...

for a hair that was not treated properly to resurface again ?

I ask this out of pure curiosity

Say you pluck a single hair that is in its growing phase.Would it start growing beneath surface immediately or does the hair go from growing to resting after its plucked ?

sorry about the off-topic question.

Not off-topic at all.

A follicle will usually regenerate a plucked ahir in 4 to 12 months, but there are a lot of variables, like age, metabolism, body area, and even time of year.

That’s why I think the best gauge of permanence is one year after final treatment. If it hasn’t grown back by then, it’s unlikely it will return.