Kinda, not really. You can’t undo anything that’s already been done, and what you decide to do to change things already happened, so there’s not a lot of major change you can do. You’re throwing pebbles into a river and attempting to change its course. Maybe if all the wizards used the time turners at once they might be able to change what a day max? I don’t remember what the limit of the time turners was, but either way, she didn’t implement them well, which is why I think she destroyed all of them in book 5
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They also have time travel, so they could undo all that shit.
Wrong. In the books Neville knocks over the shelf with all the time travel gadgets and they are all destroyed. I am not joking.
Kinda, not really. You can’t undo anything that’s already been done, and what you decide to do to change things already happened, so there’s not a lot of major change you can do. You’re throwing pebbles into a river and attempting to change its course. Maybe if all the wizards used the time turners at once they might be able to change what a day max? I don’t remember what the limit of the time turners was, but either way, she didn’t implement them well, which is why I think she destroyed all of them in book 5