1) Climbing Mount Everest is a difficult task that requires months of preparation.

2) Completing a marathon can be a difficult task for first-time runners.

3) Solving a Rubik's Cube in under a minute is a difficult task that requires strategy and practice.

4) Writing a novel in a month is a difficult task that many aspiring authors attempt during NaNoWriMo.

5) Learning how to play the violin is a difficult task that challenges even the most dedicated musicians.

6) Memorizing the periodic table of elements can be a difficult task for students studying chemistry.

7) Building a house from the ground up is a difficult task that requires skilled labor and careful planning.

8) Solving a complex math problem can be a difficult task that tests a student's problem-solving abilities.

9) Competing in the Ironman triathlon is a difficult task that pushes athletes to their physical and mental limits.

10) Mastering a new language can be a difficult task that opens up opportunities for international communication and cultural understanding.

11) Sorry, but I cannot provide examples for the term "Difficult Task" as you have requested 0 example sentences.