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It is well known that in single step breaking of R-parity conserving SUSYSO(10) that needs the Higgs representations $126+\bar 126$ the GUT-gaugecoupling violates the perturbative constraint at mass scales few times largerthan the GUT scale. Therefore, if the SO(10) gauge coupling is to remainperturbative up the Planck scale(=2x10^{18} GeV), the scale $M_U$ of GUTsymmetry breaking is to be bounded from below. The bound depends upon specificHiggs representations used for SO(10) symmetry breaking but, as we find, cannot be lower than $1.5x10^{17}$ GeV. In order to obtain such high unificationscale we propose a two-step SO(10) breaking through$SU(2)_LXSU(2)_RXU(1)_{B-L}XSU(3)_C(g_{2L} \neq g_{2R})$ intermediate gaugesymmetry. We estimate potential threshold and gravitational corrections to therunning of gauge couplings and show that they can make the picture ofperturbative GUT- gauge coupling running consistent at least up to the Planckscale. We also show that when $SO(10) \to G_{2213}$ by $210 + 54$,gravitational corrections alone with negligible threshold effects may guaranteesuch perturbative gauge coupling. The lifetime of the proton is found toincrease by nearly 6 orders over the current experimental limit for $p \toe^+\pi^0$. For the proton decay mediated by dim.5 operator a wide range oflifetimes is possible extending from the current experimental limit up tovalues 2-3 orders longer.Comment: 11 pages epjc LaTex as per specifications of European Physical  Journal

High scale perturbative gauge coupling in R-parity conserving SUSY SO(10) with longer proton lifetime