title: How can we stack 756 tiff files?
body: <p>I am doing research in snow cover using r. I am using Modis product and the tiff file should be stacked. However the stacking takes a lot of time. I waited for 14 hours and the processing wasn't completed.</p>
  <p>Is there any feature to run the 756 tiff files in a shorter time?</p>
  <pre><code>(snow_stack[is.na(snow_stack)]=0)
  </code></pre>
  <p>When I run this code, it takes hours and I don't know when will it complete.</p>