Is the appointment book is a legal record that should be kept for at least 3 years?

Yes, an appointment book can be considered a legal record, especially for businesses that need to maintain documentation for tax and liability purposes. It is advisable to keep such records for at least three years to comply with various legal and regulatory requirements. Retaining this documentation helps in case of audits, disputes, or other legal matters that may arise. However, specific retention requirements may vary depending on local laws and industry standards.