A thousand years
I've never been to Hogwarts, mainly because it's fictional.
it has been standing up for 87 years
the great wall has been standing for over 2500 years
In the book there are explosions which would lead to fires but Hogwarts was still standing and everybody could remain inside. In the film however, there is a promotional poster which shows Hogwarts burning so quite possibly it burns in the film.
Hogwarts survived the battle in Deathly Hallows, and remains standing 19 years later when Harry's children attend the school.
Wrexham swimming baths has been standing since May 1970
The phrase (not sentence) 'long-standing army' is grammatically correct. It means 'an army that has been established for a long time.'
Hogwarts Herald has never been mentioned in the Harry Potter series.
for 358 yrs
2 minutes
SINCE 438 bc
Since about 550 AD.