If you've got a super fast connection, you might be able to handle downloading 5 movies at once, at a reasonable speed. You've only got a certain amount of bandwidth & if you devote all of that to one download... nice speeds! Divide that same bandwidth between 5 downloads... oh,no, slower speeds

If it was me, I'd just do one or two at a time. That way, you'll get faster download speeds & (hopefully) get your movies downloaded before half of the hosts go offline & reduce your speed yet again. Just my opinion

Try it & see what you think!