Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_40 (duration VARCHAR, spacecraft VARCHAR)
### Question:
What is the duration of the Expedition 20 ISS Zvezda?
### Answer:
SELECT duration FROM table_name_40 WHERE spacecraft = "expedition 20 iss zvezda"