If you read enough posts here, and at Hairtfacts.com, you will understand that you are misunderstanding the process.
Think of your skin as a grid. Think of this grid as being 10 x 10 spaces in square form. If left to their own devices, the follicles in the first row, (1 - 10) will present hairs in spaces 1, 3 and 9. These hairs will cycle, and as they get ready to fall out, hairs in spaces 2, 5 and 10 begin growing, and brake surface just as hairs 1, 3 and 9 fall out.
Now it looks to the naked eye as if nothing has happened, because one saw 3 hairs in that area, and there are still 3 hairs in that space.
If one removes the hairs in spaces 1, 3 and 9, one will be targeting spaces 2, 5 and 10 when they come out in 6 to 9 weeks, and later, hairs will present in 4, 6 and 8. It takes a full 9 months for all these hairs to present. By the way, space 7 never grows hair in this example.
One should never have to treat a follicle more than 2 times. Three times is the most I can see, unless the practitioner is very bad.
So your skin grid starts like this:
X = Hair and _ equals empty space
X_X_ _ _ _ _X
X X _ _ X
_ _ X_X_X _
X_X _ _ _ _X
X X _ _ X
_ _ X_X_X _
X_X _ _ _ _X
X X _ _ X
_ _ X_X_X _
X_X _ _ _ _X
Now, in 6 to 12 weeks, the grid changes to this:
X X _ _ X
X_X _ _ _ _X
_ _ X_X_X _
X X _ _ X
X_X _ _ _ _X
_ _ X_X_X _
X X _ _ X
X_X _ _ _ _X
_ _ X_X_X _
X X _ _ _X
And it will change again in another 6 to 12 weeks. As you can see, there is the same number of hairs in the grid, but their placing has changed.
In most cases, one’s electrologist won’t be clearing all these hairs the first time out, so one is chasing the grid, looking to catch each hair as it comes out in growth phase, which gets easier to do as you clear hairs, because there are fewer left to present in the first place.
Does this help?