I think the setup is the same as on my TL and that takes me about 15 minutes total, but about 10-13 minutes of that is pulling out and putting away the tools. As was said, just one big nut to undo. Loosen the nut (I always use an impact gun), loosen the chain, slide the sprocket off, slide the new on on, re-install the nut, re-tighten the chain and your done!
IIRC my bike takes a 32mm socket, dunno of the six is the same though:O