Concerns about underarm hair removal frequency

I am considering underarm hair removal.

Even if the sole purpose is to reduce hair
I heard that I have to repeat it several times.
There is a burden regarding the number of times.

I don't want to remove it completely, but
I am expecting it to stay in a neat condition.

Whether the same number of times is required in this case as well
Or I am wondering if the intensity or frequency can be adjusted.

Duration of effect and
The frequency of re-treatment is also a concern.

When you first start
I would like to know how to make a realistic plan.