The exact length of a long, XL, XXL, XXXL watch band can vary depending on the specific watch model. Typically, watch bands are measured in millimeters (mm) and the length is determined by the distance between the lugs on the watch case.
A long watch band is generally considered to be around 8 inches (200 mm) or longer.
An XL watch band may be around 8.5 inches (215 mm) or longer.
An XXL watch band may be around 9 inches (230 mm) or longer.
An XXXL watch band may be around 9.5 inches (240 mm) or longer.
It's important to note that these are just general guidelines, and the band's length may vary depending on the brand, model and the watch case size. To ensure the correct fit, it's always best to check the band length for the specific watch model you're interested in