如果你想很久，可以用英语说"think long and hard"。这个短语的意思是在思考问题时花费很长时间，并且努力思考。它可以用来形容一个人在做决定或解决问题时花费的时间。

例句：

I had to think long and hard before I decided to quit my job and start my own business.
She was thinking long and hard about whether to accept the job offer or not.
You should think long and hard before making a decision that will affect the rest of your pfe.

中文翻译：

我在决定辞职创业之前，花了很长时间仔细思考。
她在考虑是否应该接受这份工作的工资。
你应该认真思考，才做出会影响你一生的决定。