Q: Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
Passage: Nearby, in Ogród Saski (the Saxon Garden), the Summer Theatre was in operation from 1870 to 1939, and in the inter-war period, the theatre complex also included Momus, Warsaw's first literary cabaret, and Leon Schiller's musical theatre Melodram. The Wojciech Bogusławski Theatre (1922–26), was the best example of 'Polish monumental theatre'. From the mid-1930s, the Great Theatre building housed the Upati Institute of Dramatic Arts – the first state-run academy of dramatic art, with an acting department and a stage directing department. Question: How long was the Summer Theatre in operation?
A:
1870 to 1939