我们可以有效地安排时间，并知道每项任务需要多长时间。
We can arrange time efficiently and know how long a single task will take.
这会防止你在上课的头几天里迷路，并使你熟悉从一个地方到另一个地方需要多长时间。
This will prevent you from getting lost in the first few days of classes, and familiarize you with how long it takes to get from place to place.
它在空闲连接池中找到c1，并检查它创建了多长时间。
It finds c1 in the free connection pool, and checks how long ago it was created.
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