Magento - Set all product images to small, base and thumbnail

magento-base-images.php

<?php
require 'app/Mage.php';
Mage::app();
  
$products = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*');

foreach ($products as $product) {
	if (!$product->hasImage()) continue;
	if (!$product->hasSmallImage()) $product->setSmallImage($product->getImage());
	if (!$product->hasThumbnail()) $product->setThumbnail($product->getImage());
	$product->save();
}

This is wonderful!
Is there any way to make it work in groups for bigger stores, to avoid timeouts?

I used a variation of this gist that worked on Magento 1.9

I used this to get the products

$products = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*')->setPageSize(5000);

And this to get the images

$gallery_images = Mage::getModel('catalog/product')->load($product->getId())->getMediaGalleryImages();
$path = $gallery_images->toArray()["items"][0]["file"];

Other than that, the setting of the product images works

if (!$product->hasSmallImage()) $product->setSmallImage($path);