A method of detecting the end of the life of an image bearing member has: a contact time detecting step of detecting the contact time when a developer carrying member that can be in contact with or have a clearance with an image bearing member contacts the image bearing member, the developer carrying member developing an electrostatic image formed in the image bearing member by a developer; and a determining step of determining the end of the life of the image bearing member in accordance with a parameter calculated by using the contact time detected in the contact time detecting step.

 
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