gmailAutoarchive.js

function gmailAutoarchive() {
  var archived_threads = 0;
  var delayDays = 2;
  
  var maxDate = new Date();
  maxDate.setDate(maxDate.getDate()-delayDays); // what was the date at that time?
  
  // getUserLabels returns an array of gmail labels. 
  // This way we don't have to convert the array elements and will archive all user labeled threads.
  var labels = GmailApp.getUserLabels() 
  var threads = GmailApp.getInboxThreads(0, 400);

  // we archive all the threads if they're unread AND older than the limit we set in delayDays
  for (var i = 0; i < threads.length; i++) {
    var thread = threads[i];      

    if (thread.getLastMessageDate()<maxDate){      
      var thread_labels = thread.getLabels();  
      
      for (var j = 0; j < thread_labels.length; j++){
         
         if (labels.includes(thread_labels[j])){
            thread.moveToArchive();
            archived_threads += 1;
            break;
          }
      }
    }
  }
  console.log("archived "+archived_threads+" threads")
}

This piece of code is designed to be run as a google script and auto archive threads to (try to) clean up my inbox. It will archive any thread in the inbox that a) is over 48 hours old and b) has a label (either auto or manually labeled).

Idea found from: https://medium.com/@fw3d/auto-archive-emails-in-gmail-after-2-days-1ebf0e076b1c, and forked from corresponding repo.