title: Quickest way to get amazon s3 bucket size
body: <p>As of now i am calculating the size of an amazon s3 bucket by iterating over all the objects and adding up the size of individual objects.
  This is quite time consuming.
  I tried parallelising the operation and saved some time but even then it takes a lot of time.</p>
  
  <p>System I am using : EC2 m1.large </p>
  
  <p>Is there any workarounds or better means to find out the bucket size?</p>
  
  <p>Note: i dont have access to aws console, just have the access keys</p>