GMCS for conversion from PE 2 to IPCC

hi... I am a CA final student .. cleared 1st group and 2nd group result awaited.. I have cleared CA PE 1 an than converted from CA PE 2 to directly IPCC and cleared both groups of IPCC .. I haven't done any GMCS yet though only 1 GMCS applicable to me.. please suggest me the duration by which I should complete my GMCS