She is so talented that her success can only be a question of time.

她才华横溢，事业成功只是时间问题。

youdao

Good and evil will always be rewarded; it is only a question of time.

善恶到头终有报，只争来早与来迟。

《新英汉大辞典》

We call this one 'response latency' and it means that, because it takes a lot of brainpower to concoct a lie, there may be a time lag between you asking a question and the other person answering.

我们把这一项叫做“反应潜伏期”，它的意思是：编织谎言需要非常多的脑力，这样，在你的提问和别人的回答之间就会有一段时间滞差。

youdao

How long" can be used in a question and it refers to a length of time or a length of distance.

How long” 句型用于问句中，用来询问时间或距离的长短。

How long课堂 - SpeakingMax英语口语达人

It will only be a question of time until the railroads, the steel mills, the power industry, the banks and the farming industry are nationalized.

NEWYORKER: The Lie Factory

I'm afraid the question of economic growth will be with us for a long time.

BBC: Plan B for the eurozone?

Finra's call appears to be the first time in nearly a decade that regulators have explicitly targeted the question of how Wall Street handles conflicts of interest.

WSJ: The Intelligent Investor: Conflicts of Interest? On Wall Street?