He has settled here for a long span of time.

他已经在这儿定居很长一段时间了。

youdao

If such a long-running process involves human tasks, then a user can work on the process for any time span and come back in hours, days, even months to restore the execution of the process.

如果此类长期运行的进程涉及了人类的任务，则用户可以在该进程中工作任意长的时间，并且可以在几小时、几天甚至几个月之后回来恢复进程的执行。

youdao

In the wind simulation of long-span spatial structure, both time and spatial correlation and local non-Gaussian characters should be considered.

大跨空间结构的风速模拟需要考虑风的时间和空间相关特性以及局部区域内风载的非高斯特性。

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But they call for special attention due to the implications of spread of radioactivity with long term consequences including genetic effects on the population and the long time span required to bring back normalcy to the environment.

FORBES: [See update below]

Despite growing concerns about the long-term effects of concussions, participation in youth tackle football has soared 21% over the same time span, while ice hockey jumped 38%.

WSJ: As Baseball Season Beings, Kids Are Losing Interest in the National Pastime