Some of my graduates have decades of experience at many jobs so their resumes can be lengthy. Generally as a rule I know that most human resources would prefer to see a concise resume on one page. For example in the case of someone who has a solid work history dating back to the seventies who changed jobs every five or six years what do you date back to? The last twenty years? The last five positions held? Or in the case of a younger person who has changed positions frequently.