Bounces is 12 (max). Rendered overnight (2 hours, I guess) for just four simple glass plates on a 12-thread @ 4GHz cpu.

Actually, I have to push Photoshop to its real extremes to find any differences whatsoever with the 4-bounce result above. And even then I'm not sure whether these are caused in the render or by the export to png / jpg image formats.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though