Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 从周一到周五，艾尔每天练习钢琴30分钟。周六，她练习的时间是平日的三倍。周日不练习。每周艾尔练习钢琴多少小时？


### Response:
 从周一到周五，艾尔每天练习0.5小时，所以总共是0.5 * 5 = <<0.5*5=2.5>>2.5小时。
周六，她练习0.5 * 3 = <<0.5*3=1.5>>1.5小时。
总共，她每周练习2.5 + 1.5 = <<2.5+1.5=4>>4小时。