As of 12/31/2011, how long has the employee assigned to all pending for approval papers been working in the company from the date he was hired?
pending for approval papers refer to Status = 1; length of stay in the company as of 12/31/2011 = SUBTRACT(2011, year(HireDate));
SELECT 2011 - STRFTIME('%Y', T2.HireDate) FROM Document AS T1 INNER JOIN Employee AS T2 ON T1.Owner = T2.BusinessEntityID WHERE T1.Status = 1