  The magic couple of SUSY and GUT still appears the most elegant and
predictive physics concept beyond the Standard Model. Since up to now LHC found
no evidence for supersymmetric particles it becomes of particular relevance to
determine an upper bound of the energy scale they have to show up. In
particular, we have analyzed a generic SUSY-GUT model assuming one step
unification like in SU(5), and adopting naturalness principles, we have
obtained general bounds on the mass spectrum of SUSY particles. We claim that
if a SUSY gauge coupling unification takes place, the lightest gluino or
Higgsino cannot have a mass larger than about 20 TeV. Such a limit is of
interest for planning new accelerator machines.
