It isn't harmful and usually goes away within a few hours.

其本身对身体无害，而且经常在很短的几个小时内就会缓解。

youdao

The effects of the drug naturally wear off within a few hours.

这药的效力几个小时后会自然消失。

youdao

Within a few hours, he was able to verify Spahr's prediction.

几小时之后，他就证实了斯帕尔的预测是正确的。

youdao

Malalay Ahmadzai, the mother and child healthcare specialist for UNICEF in Cambodia, says both conditions require rapid treatment in the case of blood loss a woman can die within a few hours.

VOA: standard.2009.11.10

Stratasys makes boxy machines that turn digital drawings into life-size prototype parts within a few hours.

FORBES: Almost Out of the Woods

The system is designed to see money transferred within a few hours into people's accounts.

BBC: Lloyds suffers Faster Payments System problems

Evrard, 61, was found with a five-year-old boy within a few hours of the boy's abduction, police say.

BBC: Mr Sarkozy met the assaulted boy's father