I'm not sure I fully understood the question.
As my general advice, the CV you send to a consulting firm should be a structured one-pager that best reflects (1) your work experience, (2) your academic background, and (3) extracurricular activities that reinforce the distinctiveness of your profile.
I would not dwell on the time issue. You should include, from your most recent experience, anything you think would be useful in making the reader better understand your profile.
As the years go by, inevitably the more "outdated" and/or less distinctive experiences will be replaced by new experiences.
Let me know if I caught your doubt and feel free to reply to me here or in DM to discuss this further!