shí hou
你写这篇文章用了多少时候？
nǐ xiě zhè piān wénzhāng yòng le duōshao shíhou?
How long did it take you to write this article?
现在是什么时候了？
xiànzài shì shénme shíhou le?
What time is it now?
到时候请叫我一声。
Dào shíhou qǐng jiào wǒ yī shēng.
Please call me when the time comes.