Image processing apparatus and user authentication method for image processing apparatus

A user authentication method for an image processing apparatus, the method comprising:

• authenticating a user by a first authentication unit;
• authenticating the user by a second authentication unit;
• setting the user in a logout state in which the user is unauthenticated, if a predetermined time has passed without an operation unit, which is configured to receive an operation from the user, receiving any operation from the user while the user is authenticated by the first authentication unit or the second authentication unit;
• and
• changing the predetermined time to a second time shorter than a first time, if the user is unauthenticated by one of the authentication units while the user is authenticated by the first authentication unit and the second authentication unit.

A non-transitory storage medium storing a program for causing an image processing apparatus to execute a user authentication method, the method comprising:

• authenticating a user by a first authentication unit;
• authenticating the user by a second authentication unit;
• setting the user in a logout state in which the user is unauthenticated, if a predetermined time has passed without an operation unit, which is configured to receive an operation from the user, receiving any operation from the user while the user is authenticated by the first authentication unit or the second authentication unit;
• and
• changing the predetermined time to a second time shorter than a first time, if the user is unauthenticated by one of the authentication units while the user is authenticated by the first authentication unit and the second authentication unit.