This varies depending on the hair type, skin type, frequency of visit, presence of stimulating factors such as certain medications, and any hormonal change or imbalance such as occurs during puberty, pregnancy, or menopause. Usually depending on how deep and coarse the hairs are, each follicle needs to be treated about 1-3 times. Also, at any one time only some of the hairs are actively growing and showing above the surface of the skin. The remaining hairs are dormant in the resting stage for 3-12 months. Therefore, large areas such as the legs may require 1-2 hours every week for up to 2 years to completely treat. However, one can usually see a noticeable difference in the thickness of the hair, or in the number of hairs in the treated area within a few weeks to a few months of starting treatment. Electrolysis appointments will tend to be longer and more frequent in the beginning, and then become shorter and farther apart as the unwanted hairs are permanently cleared.
The chart below is an estimate or average time for each area to be completely cleared up. It is a guide to help the electrologists make a treatment plan for their clients. There can be some variations depending on the amount of hair that each individual has, as well as the consistency of treatments, and other such circumstances.
I really like the following related article by Torontoelectrolysis.org for a similar take on the same question.
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