1.   During the war military training took several hours of the school curriculum and this did not end with the armistice.

2.   Even with the gaff in it, it took another hour to drag the fish into the back of the boat.

3.   It takes hours of practice to learn to play the guitar.

4.   It took an hour to put the bookcase together.

5.   It took hours to stick all these photos in my album.

6.   It took several hours for the police to regain control after a demonstration in the city centre turned violent.

7.   It took several hours to extinguish the blaze.

8.   Learning a manipulative skill, such as typing, takes hours.