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

### Instruction:
 Kira的猫每4小时吃一磅的猫粮。Kira在上班前给猫的碗里装了3磅的猫粮。当她回家时，Kira称了一下碗，还剩下1磅。Kira离家多少小时了？


### Response:
 Kira的猫吃了3磅 - 1磅 = <<3-1=2>>2磅的猫粮。
这需要2磅 / 1磅/4小时 = 8小时。