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

VOA: special.2009.12.07

They all need to be cooked in an oven for several hours.

VOA: special.2010.05.28

It took several hours before security forces were able to gain control of all the sites.

VOA: standard.2009.10.15

"We are going to commit all our day hours today to help clean up so that at least whatever we can save, we can save,"

VOA: standard.2009.10.04