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.
Hogwarts was founded in the 9th or 10th century, an exact date is unknown.
It's not really being excused. When everyone finishes they just go to class. They can leave at any time, as long as they won't be late for class.
A bell was never mentioned.
I've never been to Hogwarts, mainly because it's fictional.
45 minutes
A thousand years
Yes, so long as they are a witch or wizard.
7 Years.
The only thing said about Hogwarts teachers is that Neville Longbottom is teaching the Herbology class. Nothing about who the Headmaster is, though. it may be McGonagall or Flitwick but that's just guessing
A teacher. He taught Defense Against the Dark Arts class.
The only classes not required for first years were the elective classes and apparition. They had to study all of the core class and flying.
An exact measurement is unknown.
Yes infact hogwarts students are required to wear uniforms all day long even quittich matchs. they have quittich uniforms too