First I'll say, no complaints here. I'm just trying to help.
The 2 hours... 7200 seconds = 120 minutes = 2 hours (here's where that setting is on the render tab)
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There's a lot of pixelation in Josy. As a quick example:
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The background however is crystal clear. There are multiple options depending on your ultimate end need (even with a low end computer).
1. I assume you are scaling Josy up from a small render. Don't. If the main focus of your image only looks clean 1/4 scale, then release the image at 1/4 scale, not full scale. If others want to "create" the pixelation but scaling the image bigger then let them do it. But have your actual post be a clean image.
2. If you do want to release bigger, blur the background image you are inserting so it is degraded to match Josy. Having the background be clear and your model be blurry pulls the viewers focus away from your target.
3. Use an "upscaler." Google image upscaling and you can find online websites to do it.
4. Try sharpening the problem areas or running other image filters over it to clean it up.
Here's a transition image with a few quick variations on your original image as a sampling.
(original image / background blurred / upscaled-sharpened-soft light to Josy's face-downscaled / previous image but with only Josy's portion of the image having gone through the alteration process)
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The last image in the above set as a jpg
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I'll add that I upscaled and then downscaled because I do not have access to the original downscaled Josy. I upscaled to clean up the pixelation lines but wanted my final result back at the original scale. With a starting small version just doing the upscale would be the only part needed.