Claudia McClain and Tyboria Stones have both been confined to segregation for substantial periods of time.
The helicopter is designed to operate for substantial periods of time hovering at zero flight speed.
In two instances, caseworkers found that Ms. Williams had left her children for substantial periods of time.
Young men and women who remain unemployed for substantial periods of time find it very difficult to make up that ground.
He says it's rubbish, and his CV certainly backs that up, but what is true is that there were substantial periods when work was scarce, problematic or unrewarding.
Buildings, topography, and rocks may be maintained almost the same for substantial periods of time, but vegetation changes constantly, with both seasonal adjustments and annual growth.
Opera seria can lead to a lot of watch-checking, but for substantial periods on Wednesday, you forgot your watch entirely.
New surveillance officers can look forward to "sitting for substantial periods of time" and "long spells of inactivity", to say nothing of the "limited promotion opportunities".
It also found that her mother beat her with a videocassette case for punishment and tied her to a bed "for substantial periods of time".
My hunch is that governments that have been in power for substantial periods, Labour's for instance, will get the blame for the economic crisis when they eventually face the electorate – much as the US Republicans did last November.
Mourinho believes it reflects well on Chelsea to be six points behind the leaders when they have been without Terry, Petr Cech and Joe Cole for substantial periods of the season.
