A couple of hours, because typically there's just one battle; one side beats the other and that's the war for now.

几个小时,一般来说只有一次战斗,一方攻打另一方,这就是战争

耶鲁公开课 - 古希腊历史简介课程节选

You probably will get into the section you want once we're done.

一般你只需要预约一次就可以了

耶鲁公开课 - 博弈论课程节选