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_74 (length VARCHAR, year VARCHAR, version VARCHAR)
### Question:
How long was the instrumental version in 1986?
### Answer:
SELECT length FROM table_name_74 WHERE year = 1986 AND version = "instrumental"