Read the passage and answer the questions
Hello! I am Lan. I am in class 8A and I live in Ha Noi. I have five periods a day and I go to school six days a week. Each period lasts for forty- five minutes. I work hard at school and at home, but I think my parents work harder than me. I spend more than twelve hours of homework every week. Each year, I have a long summer vacation, it is a longest vacation in a year. I stay with my family or visit my relatives during the summer vacation.
How many hours of homework does she spend every week?