If you are doing VCG and VANOS seals plus the plugs hasnt been done. Its a good time to do both, may be add O2 sensors if you want to.
It will take around 4-6 hours if you do the VANOS together with VCG.
Try not to use victor reinz VCG. I changed mine in march and it leaked in August.
Now I put the Elring gasket, hopefully it wont leak.
PS: Use a torque wrench. Do not try to guess the torques on the VC bolts, you will break them. And those studs and capnuts are almost $10 a set from the dealership. You need 15(if you break them all), so careful with them.