And the hours have made things quite difficult at home.

A few hours ago this all made some kind of sense.

Just one or two hours makes a major difference in their performance.

Certainly if they had to walk, a few hours wouldn't make any difference.

I don't believe one hour of memory can make such a difference.

Three hours a day will take care of the press and make the regular run.

Eight hours of traffic could make for a very long day.

"I was going to get a few hours sleep, but half an hour won't make much difference."

What difference could an extra hour of sleep make in your life?

Well, a few more hours before reporting in would make no difference.