Although the task is arduous, it can still be finished on time.

任务虽然很艰巨，但还是可以按时完成。

youdao

This is a hard job.; The task is arduous.

这个任务很吃重。

《新英汉大辞典》

The task is arduous; besides, there's not much time.

任务艰巨，同时时间又很紧迫。

《新英汉大辞典》

Harvesting stem cells from the body is an arduous task, in part because so few of the cells exist in people.

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All that said, this is not a difficult task, although it is arduous: slow and steady wins the race, or at least gets you on the ballot.

FORBES: Why Is It So Difficult To Qualify For the Virginia Presidential Primary Ballot?

However, this leaves the MPAA with the arduous task of prosecuting single users one at a time, a prospect that is both expensive and, as some of the musicians complaining about Napster are finding, bad for public relations.

FORBES: Gnutella Could Make Moviemakers Cry