Your resume will get no more than a 10-second cursory overview to decide if it’s worth digging into. Can someone skim your complete resume in 10 seconds?
If your resume is over three pages long, odds are it’ll be tossed...and your chances for an interview were tossed out along with it.
Now, this doesn’t mean that you have to list one bullet per position so that it fits neatly on one page either! I’m happy to report that the rule of the one-page resume has lived its life, but excessively long resumes are still a no-no.