The following text is for questions 41 to 45.

Ghania's Daily Activities

    Ghania always gets up at four o'clock in the morning, then she takes a bath. At six o'clock she has breakfast. During the pandemic, she doesn't go to school. She attends online classes from home. The classes begin at half past seven, and end at half past eleven. She has lunch at one o'clock in the afternoon. She takes a bath at four o'clock and she has dinner at seven o'clock in the evening. She studies at half past seven at night. She prepares the book for tomorrow at nine o'clock at night. She prays before sleeping at a quarter past nine.

How long do the online classes last each day? They last for ____.