Here are 2 full screen 1920x1080 viewport renders under 4 seconds:
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master
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E-cycles
so under 4 seconds to get an acceptable noise level in full screen on a single 1080Ti, if you use viewport render in normal conditions (a small preview screen at about DVD resolution), it cleans in around a sec:
As you can see, it even works with glass and reflections.
PS: you can download the video with right click, the forum blurs it a lot, it’s better played with mpc-hc for example.