I'm not positive on the exact number, but it depends more on the type of gasket. A cork gasket will be a much smaller number.
My process (using a black gasket with a thin layer of rtv on each surface, OR no gasket, just rtv): Start each bolt, spin the socket extension with your fingers (NO RATCHET) until they've all been run down snug. Then do a final criss-cross tightening, starting toward the center of the pan and working your way out, just like a head (don't work AROUND the pan, don't do adjacent bolts in succession).
If you're using a torque wrench, most Nissan transmission pan bolts take 7.9Nm (0.81 kgf-cm, or 70 inch lbs).
However, I've always preferred using my "wrist meter" and watching the gasket. Good lighting and a clear view of the gasket and RTV will tell you all you need to know.