我和他共事达六年之久。

I worked with him over a span of six years.

《牛津词典》

他以为风暴是三天之内酝酿成的，其实已经酝酿了六年之久。

The storm had been working up not for three days as he supposed, but for six years.

youdao

该网站指责力拓“拉拢收买、刺探情报、各个击破、巧取豪夺”达六年之久。

The website accused Rio of "winning over and buying off, prying out intelligence... and gaining things by deceit" over six years.

youdao