For how many times has the scene "OLIVIA’S house." appeared in Twelfth Night?
"OLIVIA’S house."  refers to chapters.Description = 'OLIVIA’S house.'; Twelfth Night refers to Title = 'Twelfth Night'
SELECT COUNT(T2.id) FROM works AS T1 INNER JOIN chapters AS T2 ON T1.id = T2.work_id WHERE T2.Description = 'OLIVIA’S house.' AND T1.Title = 'Twelfth Night'