A tattoo black tattoo on the lower leg reached progress after 9 sessions at Removery over 5 years.

Before (session 0) and after (session 9) at Removery.
The tattoo
A medium black tattoo on the lower leg, more than 10 years old when treatment began.
The lower leg drains slowly compared to the upper body; ink clearance here is among the slowest.
Older ink benefits from years of natural immune-driven fading: macrophages have been working on the particles throughout the tattoo's life, reducing effective density before treatment begins.
Timeline
9 sessions over 5 years.
The laser
Removery treated this case with the Picoway, a picosecond platform.
For black ink, it operates at 1064 nm with a pulse duration of 240 - 450 ps.
Mike from GO describes PicoWay as a monster on black ink, and it is his personal choice for black ink removal.
Bottom line
Tattoos on the lower leg clear more slowly than torso work due to restricted circulation. Realistic timelines here run longer than average.
Similar cases in the gallery: Large Multicolor Upper Arm Tattoo: 50% Fading After 5 Sessions at Removery — Black and Blue Upper Arm Tattoo: 75% Fading After 4 PicoWay Sessions at Removery