What are the different haircut lengths available, ranging from 1 to 4, and how do they vary in terms of style and maintenance?

Haircut lengths typically range from 1 to 4, with 1 being the shortest and 4 being the longest. A 1 haircut is very short, while a 4 is longer and provides more styling options. Shorter lengths require more frequent maintenance to keep the style looking sharp, while longer lengths may require less frequent trims but more styling products to maintain the desired look.