For how many bodies can there be a stable orbit with no very heavy central body?
It is not unusual to have pairs of pairs or even more complex stellar systems.  Two stars make a stable pair.  A pair of these make a stable system and a pair of these would also make a stable system.  It is, however, necessary for stability for each pair to be separated by roughly 10 or more times the separation of the previous level.  This could continue ad infinitum were it not for the tidal field of neighboring systems or the Galactic potential limiting the overall size.