How long will it take her to swim the Channel?

她游过英吉利海峡得用多长时间？

《牛津词典》

How long will it take you to fly to Beijing from your hometown?

从你的家乡飞到北京要多长时间？

youdao

How long will it take to travel from Guangyuan to Chengdu (about 290 km) by Direct Express Train?

从广元到成都（约290公里）坐直达快车需要多长时间？

youdao

"No matter how long it may take us to overcome this premeditated invasion, the American people in their righteous might will win through to absolute victory...

VOA: special.2011.06.02

The how long will it take you diets?

还有关于节食周期的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

They will have to tell how long and how much it would take to pay off a card if the holder makes only the lowest monthly payment.

VOA: special.2009.05.22

So, the question recurs: How long will it take before Mr. Bush cuts his losses?

CENTERFORSECURITYPOLICY: Freedom Flame 2013

What will be the approach for entering those markets and how long will it take?

FORBES: Strategies For Small Firms Partnering With Big Companies

If I decide to take medications, how long will it take for my symptoms to improve?

CNN: Phobias