Herculian

That the Company will now submit, (willingly at least,) to such adjustment by impartial and competent persons, we think improbable. Indeed, the Herculian task of such revison would be one, from which the greatest financial talents would shrink and would moreover, for its performance require long time and great expence. It is most likely the adjustment will never take place.

Source: wiktionary

The task of preparing these facts is a thankless one; few listen to them, and a less number care for them. He will have performed a Herculian task who shall convince the American citizen that the acts of government have any influence on his interests.

Source: wiktionary

Sir, there are several things still to be done and said about the working of the Bombay Building Repairs and Reconstruction Board. It might perhaps be said that the task is a Herculian task.

Source: wiktionary

The bodily exercise has assumed such a variety of shapes as to render it a truly herculian task to give an intelligent statement of it to any person who has never seen it.

Source: wiktionary