  Novae were discovered to emit transient gamma rays during the period of
several days to a few weeks after initial explosion, indicating presence of
acceleration processes of particles in their expanding shells. In the case of
recurrent novae, electrons can be in principle accelerated in the nova shells
for the whole recurrence period of nova producing delayed $\gamma$ ray emission
as considered in Bednarek (2022). Here we extend the ideas presented in this
article by considering the fate of electrons which diffuse out of the shells of
novae supplying fresh relativistic electrons to the recurrent nova
super-remnants during the whole active period of nova ($\ge 10^4$ yrs). We
develop a model for the acceleration of electrons and their escape from the
nova shells. The electrons within the recurrent nova super-remnants produce
$\gamma$ rays in the comptonization process of the radiation from the red giant
companion and the Cosmic Microwave Background Radiation. As an example, the
case of a symbiotic nova RS Oph (with the recurrence period estimated on
$\sim$10-50 yrs) is considered in more detail. Predicted $\gamma$-ray emission
from the nova super-remnant around RS Oph is discussed in the context of its
observability by satellite experiments (i.e. Fermi-LAT) as well as current and
future Cherenkov telescopes.
