I want to know the answer to the following question:
How long was the doctrines of Galen in use for?
All the background I'm provided with is that "One mustn't overlook the doctrines of Galen: In use from his life in the 1st century AD until the 17th century, it was heresy to disagree with him for 1500 years.". Is that enough to answer the question?
Answer: yes