He then spent a number of years in surgical research.

We spent a number of hours just raking out her yard.

Some time before, the vast brain on Venus had spent a number of hours working them out.

You can't take forever or spend an unlimited number of dollars to get things done.

In secret they had then spent a number of hours learning to use them.

The site spent a considerable number of years after the second world war as a holiday camp.

However, he also spent a number of years at several other universities.

Stein spent a number of years living in Paris with his sister.

These people came here with nothing and spent a number of years and built themselves up.

He has to spend a certain number of hours each week on scholarly research.