The frequency of review for KPIs depends on the individual needs of a business. Generally, businesses should review their KPIs at least once a month, or whenever significant changes occur within the organization. This allows managers to assess how well they are meeting performance targets and make necessary adjustments if needed. It is important to understand that KPIs should be reviewed regularly and adjusted to reflect changes in the environment or goals. Additionally, as technology advances, companies may need to consider increasing the frequency of their reviews in order to keep up with changing market trends and competitive pressures.