大家来翻英语:"能用1分钟表达清楚的事情,不要用2分钟说"

don't be long-winded - 别罗索

don't spend 2 minutes describing which could be described in 1 minute

Shorten your 2-minute speech when you can say it all in one minute.
简短你2分钟的说辞当你可以用一分钟来表达全部内容。

或者
Why not make your speech short and efficient in one minute?
为什么不将你的演说用一分钟简单有效的完成？

If you can make yourself clear within 1 minute, don't use two minutes.

Don't describe 1-minute-thing in 2 minutes.