duplicate a template sheet in google sheets

duplicate.gs

function duplicate() {
  
  //number of duplicates to make
  var numOfDupes = 40;
  
  //create the spreadsheet object
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  
  //we are going to loop the number of duplicates we want
  for(var i = 1; i <= numOfDupes; i++) {
    
    //this line of code duplicates the active sheet in the spreadsheet
    //be careful that you have the correct sheet activated, or be sure to explicitly activate in the code
    ss.duplicateActiveSheet().setName('Week ' + i);
    
  }
}