I can double cable advice, it doesn’t take any time to download photos and there’s no need to do so many steppes with zip files and apps, just plug in, create a folder for a day, copy+paste.
As for numbers of photos at time, I usually go from 60 to 100, just get them in uploader and do something on another page you have opened for a couple of minutes (or spend that time getting photos together, but you shouldn’t try to open them right away when uploading starts as map takes more time and it will slow your computer significantly and you don’t want this).