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You may want to reconsider your settings and material settings because no render should take 52 hours!!! (unless you're doing a ridiculously large image)
As a render itself, it is OK. Perhaps reduce the reflections a bit in certain materials, like the worktop surface for example. It also looks like the image needs a fair bit of Photoshopping. Others may disagree with me, but I feel that Vray is used to make a model look good. Photoshop is used to make that good model look great!
Also, the wall texture has a bit too much going on. Too strong a bump map perhaps?
It's all about materials and lighting. Take a look through the forum and do some research on which settings could help your materials out. The reflections are too strong on a lot of your materials. Try to use a bump map in the floor also. Try to use the brushed metal material found in the materials folder. Looks good, but with a little more work, it could look great.
52 hours is way too long for an image. What are your render settings?
Why you use rectangular lights in every windows? I think you don't need to use that. You can get the correct illumination only with the sun. The only situation that I recommend use rectangular light is if you want to render and exterior and and interior at the same time. For Example, if you want to see a really nice sunny exterior from the interior of the building. In this case if you increase the intensity of the sun to get more brightness on the interior, you will burn out the exterior. One possible solution is to setup the sun for the exterior and use rectangular lights to throw more natural light to the interior.
But if you are going to render only the interior, you don't need the rectangular lights.
I look at your visopt. and don't see anything that could increase your time to that time. There few option that you could change. For example in the image sample you have 16 on the Max Subdivs, I never use more than 8. In the Irr Map solution you have enable Detail Enhancement and this can increase your render time. Instead that option you should use AO. The Min Rate and the Max Rate are to high according to the output size. Change those value to -4 and -1. If the render output is big, you can decrease the Irr Map Rates. If you don't decrease those value, you are going to trow unnecessarily samples, thus more render time.
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