It depends on several things. What trade are you going to be? If it‘s hard navy trade, you‘ll have to do probably have to do a MOC/Enviromental Transfer which would add on more time, as you would also have to go through the BPSO, plus the commands. Just an enviromental trans shouldn‘t be too bad, depending on the headquarters. Your navy unit would have to request a transfer from their headquarters, who would then forward the request to army headquarters, then it has to come back following the same chain. A simple enviromental transfer in your original MOC should take no more then a month, if everybody is on the ball and follow ups are done. Plus, the unit your transferring to would have to have a position for you to transfer into. I was closed out from 93-96 in Halifax, NS for Admin Clk because every unit was overborne, including navy, army and air.