How many essays to write?

<p>There's obviously the common app essay that everyone writes,
but there's also the supplemental essay for each school.</p>

<p>I highly doubt that people write a new supplemental essay for each school..
I myself am thinking of writing one essay (in addition to the common app) and
recycling it for every supplement.</p>

<p>So, how many essays do most people end up using?</p>