  There is a close analogy between electroweak instanton-induced baryon plus
lepton number (B+L) violating processes in Quantum Flavor Dynamics (QFD) and
hard QCD instanton-induced chirality violating processes in deep-inelastic
scattering. In view of the recent information about the latter both from
lattice simulations and from the H1 experiment at HERA, it seems worthwhile to
reconsider electroweak B+L violation at high energies. We present a state of
the art evaluation of QFD instanton-induced parton-parton cross-sections, as
relevant at future high energy colliders in the hundreds of TeV regime, such as
the projected Very Large Hadron Collider (VLHC). We find that the
cross-sections are unobservably small in a conservative fiducial kinematical
region inferred from the above mentioned QFD--QCD analogy. An extrapolation --
still compatible with lattice results and HERA -- beyond this conservative
limit indicates possible observability at VLHC.
