The wizard in Hogwarts is unscientific

"Maybe there is..."

Dumbledore said slowly: "But no one knows where it is recorded. Even the Ministry of Magic can't repair the damaged time turner now."

"All right!"

Andy made an 'OK' gesture, "It can only be used for studying...it's actually pretty good."

No matter what, the time turner is a prop that can reverse time.

Andy just wants to witness the magic of it now.

If this thing is really useless, Andy may choose to cancel a few courses to make his time abundant again.

"That's right, Professor."

Andy suddenly asked: "Since the time turner cannot change the past, what is its upper limit? It can turn back time by a few hours at most?"

This thing is very problematic!

Andy suddenly thought that if someone used a time turner to go back in time and witness the development of some events, then his infiltration into the Ministry of Magic would have been discovered long ago.

However, until now, the Ministry of Magic has not sent anyone to arrest him.

And Sirius.

The Ministry of Magic also did not use the time-turner to find out how Sirius escaped from Azkaban.

Didn't expect that? Are there any usage restrictions?

"Its usage is capped at five hours."

Dumbledore explained: "If you use a time turner to go back five hours, a serious time accident will occur.

Andy nodded upon hearing this.

Five hours...

That’s okay!

But looking at it this way... the time turner can only be used for five hours, and you can't use it to change the past, or even let your past 'self' see your future self.

This thing seems to be of no use!

Except for some special circumstances, the time converter is basically useless.

"I see!"

Andy promised again: "I won't use it for anything other than studying."

Dumbledore nodded, handed the two time turners to Andy and Hermione respectively, and said, "It's getting late, you should go to class."

"Professor, goodbye!"

After leaving the principal's office, Andy hung the time turner around his neck and put the timer on the other end in his clothes to ensure that it would not be seen by outsiders.

"Today is Thursday. I remember there are Charms and Defense Against the Dark Arts classes in the morning."

Andy recalled today's class schedule, "In the afternoon there are classes on Transfiguration and Divination, and in the evening there is a class on History of Magic."

"But the Divination class and the Arithmetic Divination class are held at the same time, so we have to use the time turner to go back two hours after the Divination class."

Thinking of this, Andy's head got bigger!

The schedule of courses is full, and there are classes all day long, even in the evening.

How is this different from going to high school?

"Oh~Merlin's pants!"

Andy said with a look of despair, "We have a whole day of classes today."

"Not just today..."

Hermione gave Andy another hard blow, "Our daily classes are fully booked. Even so, the time is not enough. We have to use the time turner to take a few more classes."

"If there is a lot of homework, we will have to spend a little more time on homework."

By the end, the little witch was full of fighting spirit and couldn't wait to go to class.

Andy: "..."

What evil have I done!

…

The Charms classroom is also on the eighth floor. After walking around the corner, you arrive at the door of the Charms classroom.

This lesson was with Gryffindor.

Professor Flitwick, standing on a stack of books, used his passionate voice to talk endlessly about the techniques for using a certain spell - the spell he learned last semester.

Andy sat below and listened expressionlessly, feeling a little drowsy for a while.

Hermione glanced at Andy sideways, stretched out her finger and poked Andy's waist.

Andy immediately sat upright.

"Time reversal spell..."

The content of the class was of little use to Andy, so Andy simply used this time to think about some of his own things.

Dumbledore said that the Time Reversal Curse had been lost and no one knew where it was recorded. Even the Ministry of Magic has no way to repair or build a time turner now.

Andy believed it.

Magic books also have magical powers.

Just like the "Invisible Book of Invisibility", it is a magic book that can make you invisible - because the spell itself has a certain magic power.

When a spell is written down in a book by a wizard, that book possesses a certain amount of magical power.

Most books in the wizarding world are like this.

The same principle can be proved:

If someone writes the 'time reversal spell' in a book, then the book has the power to reverse time - it will hide itself at a certain point in the past.

So we will never find the book 'now'.

"So... if you want to learn the time reversal spell, you must go back to a certain point in the past, find the 'back to the past' book, and then bring it back to the present."

"If that book really exists, this is the only reasonable explanation!"

Andy tried to analyze it.

If someone invents a spell that can reverse time and uses the spell to create a time turner, then he will definitely record the spell and pass it on.

This is a priceless wealth.

No one will give up this wealth

Therefore... there must be a book recording the 'Time Reversal Curse'.

It's just that this book has the power to reverse time. It hides itself at a certain point in the past.

So the spell is lost!

"If there is a place in the magical world where you can find this book..."

Andy believes that that place must be the data storage room of the Department of Mysteries!

"I have to go now!" Andy thought to himself.

First find the data storage room of the Department of Mysteries, and then use the time turner to go back in time...

Thinking of this, Andy frowned slightly.

Andy never believed that others could not think of things he could think of.

The time-turner is in the Department of Mysteries of the Ministry of Magic, and Andy doesn't believe that the Silent People haven't tried to go back in time to find the book that can reverse time.

Yet the spell was lost.

"Didn't find it?"

"Or... we have to go back to a fixed point in time!"

Andy thought of a possibility.

If the book was hidden one hour, twenty-eight minutes and thirty-six seconds ago, then you must go back to that second of time accurately.

Because only in this way can you find the book.

In addition, even if it is just a second, you will not be able to see the book.

"Tsk!"

Andy felt that his analysis should be correct. The book was definitely hidden at some point in the past.

But if you want to find it, you must go back to the past accurately.

The premise of all this is that you must know the time coordinates of that book!