Three years was the time required to go through the high school.

It required very little time, effort, and attention from him.

He paid the price of the time and effort required.

We have issues to work through that will require time from now until 2012.

Finding exactly the right place, though, would have required more time if they had not used the same site for a number of years.

The second obviously required more time, and so got less attention.

Significant to the building's history is the short period of time required for its construction, just over two years.

This may require less time than waiting for the light to turn green.

Thus the time required per stop was reduced from days to hours.

Most require time to develop the skills to use them.