Ok, so two things stand out.
First, you're using placebo as your encoder preset. This is slow, stupidly slow.
Searching for some comparisons between the different presets that show how slow it is was more difficult than expected, most people don't even test this setting. Found one comparison here anyways luckily. The first graph (red line) shows how many fps/second were achieved on average. The fastest preset they tested, veryfast, is 68 times faster than placebo.
For reasonable values I'd use medium or slow, which are still 20 times or 10 times faster with minuscule quality differences. Also see the FFMPEG FAQ on why placebo is stupid.

Now for the second thing. I get why you put 0 as CRF, but that's not a good idea. You'll most likely have a bigger file in the end than what you started with.
The bluray itself does not contain enough details to actually need such a low CRF. 17 or 18 is visually lossless, as in you won't be able to tell the difference with your eyes. For my encodes I use 20 most of the time, as it still more than good enough. Reasonable values, if you want a smaller file size are up to ~28.

TLDR: use slow with CRF 20 as a starting point.

I hope some of this made sense to you and sorry if it comes over as too agressive.
Still, hope this helps you get what you want.

Edit: One more thing I thought about. You can use the hardware encoder in your GPU if you want. However, that will come with worse quality and bigger files than encoding on the CPU. Still something you might want to look at just to compare.