For 3D case the above procedure for 16..32..64 boxes sets requires about 3,6..7,8..15 sec mean total run time (with boxes allowed to turn around any axis) to achieve average packing efficiencies 82,5..83,5..84% correspondingly (see demo Y3d_nn.exe). Noted efficiencies are not fully optimized and may be increased by method / algorithm further adjustment or by calculation time essential increasing.