The time frame for applying for Class C medical device registration with the Saudi Food and Drug Authority (SFDA) can vary depending on several factors such as the complexity of the device, the completeness of the application, and the need for additional information or inspection. However, generally, the entire registration process for a Class C medical device can take approximately 3 to 6 months from the submission of the application to the final approval, provided that all documentation is complete and compliant with SFDA regulations.