  We present complete O(alpha_s^2) corrections to the decay b-->c+l+nu at the
point where the invariant mass of the leptons sqrt{q^2} equals the c quark
mass. We use this result, together with previously obtained corrections at the
ends of the q^2 spectrum, to estimate the total width of the semileptonic b-->c
decay with O(alpha_s^2) accuracy, essential for the |V_{cb}| determination.
