When should nail polish be removed from a client's nails?

Nail polish should be removed from a client's nails when the client requests a change. Client preference is paramount in the service industry, and their satisfaction is crucial for building a good relationship and ensuring repeat business. When a client expresses a desire for something different—whether it's a new color, a different finish, or simply a change in style—responding to that request demonstrates professionalism and attention to customer service.

While the other options suggest specific time frames or conditions for polish removal, they fail to prioritize the client's needs and wishes. Nail polish durability can vary based on many factors, such as the specific products used and the client's lifestyle, making a fixed schedule for removal impractical. Prioritizing the client's request ensures they feel valued and respected, which is essential in creating a positive salon experience.