3 pages isn't some unforgivable sin by any means, but that is the range where people start to wonder about your ability to prioritize your background. 1-2 page

3 pages isn't some unforgivable sin by any means, but that is the range where people start to wonder about your ability to prioritize your background. 1-2 pages are always safe, assuming you can say what you need to say. For 10 years of experience, most resumes I see are probably a full 2 pages, but rarely more. The number of jobs you've had (and choose to list) also is a factor, which is particularly challenging for contractors with multiple gigs.