How long did it take to build Hogwarts?

The exact duration of Hogwarts' construction is not detailed in the Harry Potter series, but it is generally believed to have taken several years. According to J.K. Rowling's lore, the castle was established over a thousand years ago, around the 9th or 10th century, by the four founders: Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw, and Salazar Slytherin. The extensive and magical nature of the castle suggests that its building process was complex and time-consuming.