The official VAG removal time is 4 hrs, I got it done by my local dealer as they had got a goodwill agreement with Audi to cover most of the cost of the starter.
I suspect it took them slightly longer. Removal involved removing the alternator first for access as the starter is directly behind it. The closest engine mount was also unbolted to get movement for improved access. Space looks tight in that region on the Q7, a D3 might be better.
As for the chains, the quickest way would be to drop the front subframe, suspension and engine/autobox together if you can get access to a lift. That way you have clear access to the rear face of the engine. Obviously some locking tools would be needed for the timing gear. Not a job for the faint hearted I suspect.
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