Such unproductive time becomes excluded from the historical narratives - and is endangered by complete erasure.

这些多余的时间被从历史叙事中剔除—有被全然抹杀之虞。

youdao

Research workers are well aware that much of their time and effort is unproductive.

研究工作者们很清楚他们的大部分时间和努力都不会有成果。

《柯林斯英汉双解大词典》

All play and no work: Losing track of time surfing the Internet can result in an unproductive day.

尽是玩儿，却不工作：上网没有时间观念就会导致一天徒劳无获。

youdao

Royal Mail said the key issue was the "need to make use of unproductive time between deliveries" so that customers had mail delivered earlier in the morning.

BBC: Still no agreement in postal dispute

What seemed like a good idea at the time has become unproductive overlap now that RadioShack sells Cingular phones and calling plans.

FORBES: RadioShack's Quick Fix

While sales and marketing squabble, the customer becomes increasingly unhappy with their sales interactions which are considered unproductive 97 percent of the time.

FORBES: Sales and Marketing Alignment Begins with the Customer