42. How long do you need when counting birds each time?

42.每次数鸟时需要多长时间？

He kept checking his watch; Harry. knew that he was counting down the time until Buckbeak's appeal started.

他一直在看表，哈利知道他在倒计时，计算巴克比克案上诉开始的时刻。

The researchers found that-even not counting time doing schoolwork on screens- the kids spent between almost five hours to seven hours per day on their devices, with the older kids online the most.

研究人员发现，即使不算使用屏幕做作业的时间，孩子们每天使用电子设备的时间也在5到7个小时之间，年龄较大的孩子上网时间更多。