hahaha. If you need a render farm and more than 27 hours for a basic living room scene, that is a sure sign that you are going overkill. That’s why you’ll see a lot of people warn against touching the .ini’s, because you don’t actually know what you’re tweaking. So you’re running a whole lot of extra calculations for random settings. Maybe take it one setting at a time and document your results.
Also, it looks like your CPU might be aging a little? Lightmass is entirely CPU based and works great for CPUs with lots of cores.