Create directories in google drive from folder structure saved in spreadsheet

Code.gs

//Script limit is 6 min = 360 sec and folder creation operation lasts for half of a second.
//So max folders created in one run is around 360sec * 2 = 720
//To prevent time limit error was used workaround from https://ctrlq.org/code/20016-maximum-execution-time-limit

function onOpen(e)  {
  SpreadsheetApp.getUi()
    .createMenu('Create folders')
    .addItem('Create in current folder', 'createFolders')
    .addItem('Create in current folder, starting from row', 'createAtRow')
    .addItem('Create in root', 'createAtRoot')
    .addItem('Create in root, starting from row', 'createAtRootAtRow')
    .addToUi();
}

function onInstall(e) {
  //run once to grant access rights to the script
}

function createAtRoot() {
  var folder = DriveApp.getRootFolder();
  createFolders(0, folder);
}

function createAtRootAtRow() {
  var folder = DriveApp.getRootFolder();
  createAtRow(folder);
}

function createAtRow(folder) {
  var row = Browser.inputBox("Enter starting row");
  
  while(isNaN(row) || row % 1 !== 0 || row < 1) {
    if(row == "cancel") {
      return;
    }
    row = Browser.inputBox("Invalid parameter '" + row + "'. Enter starting row");
  }
  createFolders(row - 1, folder);
}

function isTimeUp(start) {
  var now = new Date();
  return now.getTime() - start.getTime() > 300000; // 5 minutes
}

function createFolders(startRow, folder) {
  try {
    var msg;
    var start = new Date();
    var sheetName = "Sheet1";
    var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
    var values = sheet.getDataRange().getValues();
    var valuesLength = values.length;
    var currentFolder = folder || DriveApp.getFolderById(SpreadsheetApp.getActiveSpreadsheet().getId()).getParents().next();
    
    for(var i = startRow || 0 ; i < valuesLength; i++) {
      if (isTimeUp(start)) {
        msg = ("Time out exception. Ended on row " + i);
        break;
      }
      
      var row = values[i];
      var rowLength = row.length;
      var tempFolder = currentFolder;
      
      for(var j = 0; j < rowLength; j++) {
        if(row[j] != "") {
          if(tempFolder.getFoldersByName(row[j]).hasNext()) {
            tempFolder = tempFolder.getFoldersByName(row[j]).next();
          } else {
            tempFolder = tempFolder.createFolder(row[j]);
          }
        }
      }
    }
    if(msg) {
      Browser.msgBox(msg);
    }
  } catch(e) {
    throw e;
  }
}