It’s not possible to predict the exact number of sessions required to remove any kind of tattoos as it depends on many factors:  such as, 

• The quality and quantity of the Tattoo pigment
• The deepness of the pigment in the skin
• The age of the tattoo
• The surface of the tattoo
• The location of the tattoo
• The thickness of the skin
• The number of cosmetic retouches done

Averagely a typical Eyebrow Tattoo may be removed in about 4 to 5 sessions while others may take more or less depending upon the factors mentioned above.

Some clients may only want to lighten the old brow in order to cover so clients may also need less then 4 sessions based on goals.