// get the first 1000 results
var results = search.create({
  type: search.Type.TIME_BILL,
  filters: filter,
  columns: ['internalid', 'memo', 'rate', 'casetaskevent', 'datecreated', 'employee', 'hours']
}).run().getRange({ 
  start: 0,
  end: 1000
});

// get up to 4000 results
var results = [];
search.create({
  type: search.Type.TIME_BILL,
  filters: filter,
  columns: ['internalid', 'memo', 'rate', 'casetaskevent', 'datecreated', 'employee', 'hours']
}).run().each(function(result) {
  results.push(result);
  return true;
});