Write SQL query to solve given problem: What are the average download times for the a release tagged "1980s"?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(T1.totalSnatched) AS REAL) / COUNT(T2.tag) FROM torrents AS T1 INNER JOIN tags AS T2 ON T1.id = T2.id WHERE T2.tag = '1980s'