After a few weeks, increase your time to fifteen or twenty minutes, and increase the number of days.

VOA: special.2010.06.08

It can take from twenty minutes to more than two hours for them all to leave.

VOA: special.2009.12.07

The American Cancer Society says blood pressure returns to normal twenty minutes after the last cigarette.

VOA: special.2010.03.09

"If it's like during school when things are busy, once maybe for like twenty minutes max.

VOA: special.2009.09.14

For more than twenty minutes, he floated outside his spacecraft in the emptiness of space.

VOA: special.2009.07.01

The water reached the northern edge of Sumatra about twenty minutes after the earthquake.

VOA: special.2009.03.17

The crowd cheered wildly for over twenty minutes.

VOA: special.2010.07.19

He had floated around in the emptiness of space for twenty-one minutes.

VOA: special.2009.06.24

The planed landed in Wales twenty hours and forty minutes later.

VOA: special.2010.05.26

The boat and twenty-nine men disappeared into Lake Superior minutes later.

VOA: special.2009.11.11