Let's play optimist. Let's say that you have applied to at least a half-dozen schools. If you're a savvy applicant, you have spread the hoped-for wealth of your possibilities across the “Reach-Ballpark (sometimes referred to as Target)-Safety" spectrum. Of course, I realize that many seniors these days are hardly satisfied with, or feel secure about applying to only six colleges.
I've seen or heard about seniors who have applied to 10, 15, even 20 (!) colleges, a feat that has been enabled by the Common Application. While I may be able to see ten applications out there working for you, quite frankly, 15 or 20 applications is just plain excessive, in my professional opinion.