 In 1771, Fieldmarshal Lieutenant Hannig published the official studying plan, and in 1775, Maria Theresa published the Academy Rules.At this time, it took 11 years to complete the Academy, but step by step, it was shortened to 3 years.The Styrian Prince Erzherzog Johann (Archduke John) was the principal headmaster of the academy for 44 years (1805–1849).