Now keep that up for ten minutes and don't talk.

The second time around, the family kept this up for more than a year.

It's really hard to keep that up for a long time.

Perhaps we can all keep it up for one night.

Now if she could only keep it up for a few more minutes.

You should be able to keep this up for 30 minutes or more.

We knew a team can't keep that up for 40 minutes.

You have to keep it up for 24 hours a day.

You won't be able to keep this up for more than another five or six years.

None of them could keep it up for many minutes.