Since we never see the rebuild it's not known how long it takes but the school was back up and running by September 1998 - although possibly parts were still being fixed.
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It is never stated.
Hogwarts exists only in the Harry Potter series.
The Hogwarts gamekeeper (also known as the Hogwarts groundskeeper) is a Wizard employed by Hogwarts School of Witchcraft and Wizardry to tend to and look after the grounds of the school, as well as the security of Hogwarts Castle. It is Rubeus Hagrid.
Harry Potter's school is called Hogwarts School of Witchcraft and Wizardry. In the fourth book, Hogwarts hosts the triwizard tournament and students from two other schools come to compete. These schools are Beauxbatons Academy of Magic and Durmstrang Institute.
The Great Hall of Hogwarts is located on the bottom floor, next to the entrance.