title: Spread load evenly by using ‘H * * * *’ rather than ‘5 * * * *’
body: <p>When setting up how Jenkins shoul pull changes from subversion
  I tried checked Poll SCM and set schedule to <code>5 * * * *</code>, I get the following warning</p>
  
  <blockquote>
    <p>Spread load evenly by using ‘H * * * *’ rather than ‘5 * * * *’</p>
  </blockquote>
  
  <p>I'm not sure what H means in this context and why I should use that.</p>