Quite a lot....
The images were made with Pasquale Tricarico's WinOrsa orbit software
Update: some more plots of a few individual LEO sat orbit constellations here
SatTrackCam Leiden (Cospar 4353) is an amateur satellite tracking station located at Leiden, the Netherlands. Using a camera it makes accurate positional measurements on satellites of interest, mostly classified satellites -i.e. spy satellites- in order to determine their orbits.