The duration of Ground Force is 1800.0 seconds.
The impact force depends upon the height from which it has fallen (IE- its velocity upon impact), and the duration of impact (determined by the elasticity of the collision). However, the object exerts no force upon the ground *while* falling.
The duration of Losing Ground is 1.5 hours.
The duration of Forbidden Ground is 1.38 hours.
The duration of Ear to the Ground is 1800.0 seconds.
The duration of Love on the Ground is 2.08 hours.
The duration of The Ground Truth is 1.2 hours.
The duration of Shaky Ground is 1800.0 seconds.
The duration of At Ground Zero is 1.87 hours.
The duration of The Dumping Ground is 1800.0 seconds.
The duration of On Hostile Ground is 1.5 hours.
The duration of Shallow Ground is 1.62 hours.
The duration of The Force - film - is 1.57 hours.