Because different team members may take different amounts of time to complete a task, it hardly makes sense to finalize a time estimate without an assignment.

因为不同的队员，完成一项任务所用的时间是不同的，所以在没有一项分配方案的情况下，很难合理地完成一次时间评估。

youdao

Archeologists are able to estimate the age of these objects by dividing layers of dirt into time periods.

VOA: special.2009.08.18

The number of mutations over time helped the team estimate when the duplications in soybeans took place.

VOA: special.2010.02.02

Guided setup was pretty easy, but the time estimate was way off, maybe this is because we used the Ethernet port instead of the phone line.

ENGADGET: Review: Series3 TiVo HD

The two versions of Google Maps and the Apple software pretty much gave me the same directions and time estimate just over 10 hours, though we were planning on 12 with stops.

WSJ: Review: iPhone Google Maps lags Android version

We found Mr. Vandegrift to be generally honest and forthright, but his time estimate is suspect given his employment as a salesman for an employer in a business unrelated to the real estate activity.

FORBES: Be Prepared to Prove the Time You Spend on Losing Side Activities