title: Measurement of execution time of built-in functions for Spreadsheet
body: <p>Are there methods to measure the execution time when built-in functions completed for Spreadsheet? When I use several built-in functions (For example, IMPORTHTML and IMPORTXML), if I know the average execution-time, it is easy for me to use and design data sheet.</p>
  
  <p>I measure it of custom functions using this script.</p>
  
  <pre><code>function myFunction() {
    var start = new Date();
  
    // do something
  
    var end = new Date();
    var executiontime = end - start;
  }
  </code></pre>
  
  <p>Thank you so much for your time and advices.</p>