What is the closing and opening time of businesses located at Glendale with highest star rating?
Glendale is a city; the highest star rating refers to MAX(stars)
SELECT T2.opening_time, T2.closing_time FROM Business AS T1 INNER JOIN Business_Hours AS T2 ON T1.business_id = T2.business_id WHERE T1.city = 'Glendale' ORDER BY T1.stars DESC LIMIT 1