Why didn t Hermione use the Time-Turner to save Dumbledore?
Because it's too dangerous to go further back than a few hours. Why didn't anyone use the Time-Turner to save the lives lost in the final Battle of Hogwarts? Because by that point, no more Time-Turners were left in existence.
Why does Hermione use the Time-Turner to get to class?
Professor McGonagall gave Hermione Granger the Time-Turner at the start of her third year, allowing her to take multiple classes that overlap and would be impossible to attend in real-time.
Why didn't Hermione use the Time-Turner to save Harry's parents?
The time turner couldn't have been used to save Harry's parents because it was too far back in time; you cannot go back more than five hits without there being very bad consequences. They saved Buckbeak because he was about to die three hours before.
A Time-Turner is a magical object introduced in the third book. The item is used to turn back time and change the future. An owner of the Time-Turner was Hermione Granger who used it to be able to attend all the Hogwarts classes, when she had different classes at the same time.
Why didn't they use the Time-Turner more in Harry Potter?
J.K. Rowling addressed the time-turner plot holes by introducing limitations on time travel and ultimately destroying all time-turners. The destruction of all time-turners in "Order of the Phoenix" prevented further use and solved the plot holes in a messy way.
Honestly, Hermione knew Dobby was a lost case... nothing could have revived Dobby after the attack or she would have definitely helped Harry with Dobby considering she was the girl who started S.P.E.W(Society for the Elfish welfare) and fought for elf rights. There was nothing to be done at that point.
Why didn't they just use the Time-Turner to stop Voldemort?
These instances followed Rowling's stance on self-fulfilling prophecies. With the established Harry Potter time travel rules, Harry and his friends never had the option of traveling back in the past to kill Voldemort. If they were to do so, Voldemort would already be dead in the present timeline.
Dumbledore's lack of belief that Sirius is innocent is also suspect. Sirius was a member of the Order of the Phoenix which fought against Death Eaters, but Sirius also was as close to James as a brother, the Potters even took him in when he ran away from home.
History. This broomstick was arranged for Harry by Professor Minerva McGonagall after he was given a spot on the Gryffindor Quidditch team, as Seeker. He rode this broom in all school Quidditch matches until 1993, when, during a match against Hufflepuff, he was attacked by Dementors and fell off his broom.
After the Mintumble incident, the Department of Mysteries terminated such experiments, and Ministry of Magic laws dramatically restricted the use of time-turners.
In Harry Potter and the Cursed Child, Harry's son, Albus Potter, and his best friend, Scorpius Malfoy, used a Time-Turner to go back in time to the Triwizard Tournament to save Cedric Diggory's life.
However, the Hogwarts headmaster was not a comforting character with unconditional love that Harry would want at his side as he died. Rather, as an insightful adviser, Harry had Dumbledore waiting for him in Limbo where he could choose to live or die after being “killed” by Voldemort.
"It's called a Time-Turner," Hermione whispered, "and I got it from Professor McGonagall on our first day back. I've been using it all year to get to all my lessons. Professor McGonagall made me swear I wouldn't tell anyone. She had to write all sorts of letters to the Ministry of Magic so I could have one.
Never in the books was it stated that every time-turner was destroyed. The closest is a conversation with Hagrid in HBP, where he jokes that they would have struggled to fit in Care, even with Time Turners. In response, Hermione replies stating "We smashed the entire stock of Ministry Time-Turners".
In the film, she only hugs Harry, and just gives a hesitant handshake to Ron (Note: This was the result of Emma Watson being hesitant to hug both Daniel Radcliffe and Rupert Grint in public view, with her hugging Radcliffe during filming having to be frozen for a few seconds to get the desired effect due to Watson ...
They know she's an impostor. They've been warned", so obviously the request for the wand was unexpected even to him. It's thus pretty safe to conclude that the real Bellatrix had reported her wand stolen and alerted Gringotts prior to the trio's attempted break in.
When Dobby's last words before dying in Harry's arms are "Such a beautiful place, to be with friends. Dobby is happy to be with his friend, Harry Potter."
Why didn't Dumbledore use the Time-Turner to save Harry's parents?
IIRC, you can only use the time-turner to go back 5 hours or thereabouts. Any more than that could seriously harm whoever is using the time turner. So that's why it was no longer possible to save James and Lily Potter during Harry's time.
Why didn t Hermione use the Time-Turner to save Sirius?
Changing the past is hazardous and apparently nigh impossible. Buckbeak could be rescued because he already had been rescued, while Sirius was seen to have died by several witnesses. Even if it were possible, Hermione only had the Time Turner for one year.
What happens to Buckbeak after Prisoner of Azkaban?
With the help of Harry Potter, Hermione Granger and her Time-Turner, Buckbeak escaped execution in 1994 and he came under the care of Sirius Black. Sirius kept Buckbeak with him while on the run during the 1994–1995 school year, and later kept him in his mother's bedroom while in hiding at 12 Grimmauld Place.
