For how long did the complaint filed on 2017/3/27 by Rachel Hicks last?
how long did the complaint filed last refers to ser_time; on 2017/3/27 refers to "Date received" = '2017-03-27';
SELECT T2.ser_time FROM client AS T1 INNER JOIN callcenterlogs AS T2 ON T1.client_id = T2.`rand client` WHERE T1.first = 'Rachel' AND T1.last = 'Hicks' AND T2.`Date received` = '2017-03-27'