A bit of a headache with this one... luckily, the standalone Nvidia denoiser came to save me from punching the wall yet again...
Long story short, I had to stop and resume the rendering process a dozen times, and, a ascene that wouldn't take more than 4, max 5 hours, was still at 22% converged after 9 damn hours, because of the long, and numerous, interruptions. I had the denoiser folder, but never bothered to use it, so, this noisy, half-baked piece looked like a promising experiment base, and, boy was I happy with the result... the photoshopped final version, I call "Narcissism", but, for the sake of comparison, I'll add the pre-denoiser, and post-denoiser versions as thumbnails as well...