The process could take several weeks and often required a great deal of staff time.

This process might have required years, had I not taken action.

The whole process had not required more than 10 seconds.

This process can also require a lot of time and computer resources.

This process required the paper to go to press several hours earlier than usual.

"How long would the process require with a heavy wall?"

The process of filling the large bowl required several minutes.

"This process clearly requires a lot of energy," she said.

The process requires several hours and careful focus so as not to break the ball.

The reverse process will again require a lot of time.