The port opens after recognition, and you have 30 seconds to log in.

识别出序列之后端口打开，必须在 30 秒内登录。

youdao

Ross: You have 30 seconds. And the lightning round begins—stop it (Chandler stops jumping)—now.

你们有30秒。 好。闪电赛现在…停下来。开始。

youdao

If you have increased the short runs to 30 sec run/30 sec walk, on a hot day you should run 15 sec/walk 30 seconds.

如果你已经增加到跑30秒+走30秒的循环了，那当天很热时，就应该实行跑15秒+走30秒的循环。

youdao

But for those of you that have been here for 30 seconds or longer see if you can get the right answer in here.

但那些已经来了30秒以上的同学,看看你们能不能得到正确的答案。

麻省理工公开课 - 化学原理课程节选

While some of your messages have all the right elements, they may be too long or complex to fully explain in less than five minutes (remember, you only have about 30 seconds).

FORBES: Make Your Message Tight And Simple -Media Training

You can have promotion in 30 seconds if your stuff is good.

FORBES: Don't Publish That Book!