Here’s how much is too much on a resume:
Any information that’s irrelevant to your target job is unnecessary to include on your resume, especially if it pushes your resume onto a second page. Also, don’t add jobs from more than 15 years ago.
Cutting details that don’t match the job requirements makes your resume more relevant to the position, and ultimately boosts your chances of getting an interview.
However, there are exceptions to the one-page rule:
If you have 10+ years of experience, use two pages
If you’re applying to a senior management position, use two or three pages to list your accomplishments and work experience
If you’re seeking a job in academia, use three or more pages to fit your publications
If you’re targeting a government job, submit a three-page federal resume