When a model's booked out, that means she's not working at all for a certain length of time.

When a certain length of time passes, he heads for the palace.

Things do need a certain length of time to speak.

Then, forum members have a certain length of time to vote on who they think is the best.

It would only allow you to use a certain length?

So we take a key of a certain length.

You have to keep these records for a certain length of time so that they can check them when needed.

Control Points are captured by standing on them for a certain length of time.

Some jurisdictions require that a company be in business for a certain length of time to have this ability.

The user pays to play for a certain length of time.