Fast forward just about four years later, and the company's literally ten times larger.

此后戴尔快速发展，仅四年的时间，就壮大了十倍。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选

And "it" definitely just refers to time and you only use "it" when you're talking about time.

这时，“it” 一词仅指时间，当你在谈论时间的时候，只能使用 “it”。

How long课堂 - SpeakingMax英语口语达人

But when you have many page views and that many people spending much time on the site, you can monetize it pretty easily just by putting matters on there.

当拥有那么大的访问量,当人们花大把时间在你的网站上时，仅靠投放广告,就能轻松赚钱。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选

So basically, the whole society was spending all of the time raising enough food just to support life and there was only 5% left over and that ended up being used in ways like this.

基本上,整个社会全部时间都被用于积累足量食物,这仅是为了维持生计,只剩下5%的时间,被用来建造金字塔,为法老服务

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选