In space, no one can hear you scream.
They also can't see you paginate your email submission.
"Whut?" I can hear you say.
"What on earth are you talking about? Did you leave your mental acuities in Canada?"
Well, no, all evidence to the contrary this week.
What I mean is this: you guyz are sweating bullets on three-page synopsis, five-synopsis, three-five page synopsis, when in fact page numbers do NOT appear in email submissions. Thus no one really knows the difference between a three, four, or five page synopsis.
Generally you want to keep a three page at about 750-900 words. If it hits 1000 words (thus 3.5 pages) no one will notice or care.
When agents say 3-5 pages, or 3-5 page synopsis what they mean is "don't send ten" or "don't send the whole manuscript."
There is no magic distillation of the synopsis to 3-5 pages that makes it better. It's simply to avoid the splat of words that would come if we didn't specify. "Here's my entire novel plus a synopsis, and it's a lovely 165,000 page epic fantasy that really starts in chapter 10" And don't think I haven't seen those.
Submission guidelines are just that: guidelines. They're intended to help you, not make you crazy.
That they do make you crazy is just a bonus of course.