LEO satellites are cheaper to build and launch and have lower propagation delays.
The orbiting periods range from 90 minutes to two hours, while the radius of the footprint of LEOS vary from 3000 to 4000 Km. Unlike the GEOS, LEOS are above the local horizon at maximum only for 20 minutes for an observer. Thus, one satellite hands service over to the succeeding satellite once its move out of the local horizon of the viewer to maintain round the clock service.