i think 200 hours for all those renders is over kill even for vray
Why ? 20+ hours per image for a hi-res single image isn't that long. Do you know Marek Denko's render times ? (He writes them under images often), for example his recent personal project was 12 hours, across 4 machines, but he had higher as well.
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http://marekdenko.net/?page_id=105 ]
It's not commercial project, so there is no reason to settle with something less than showing your work in full high quality, which means no short-cuts and good resolution/high sampling. So, looks like very normal render time to me.
And judging not only by myself, but also from popular threads at Chaos, I know lot of people use 20+ hours per render (judged by average single machine i7 performance to unify this "benchmark" ). Just because some people are fine with 20 minutes,
doesn't mean those who use high settings don't know what they are doing/can't optimilize, they just choose technical quality without compromises. Seems correct to me.