Did the BMW test with both CPU and GPU and did some with half samples with the denoise feature.
Update: pushed the samples and light paths down as i can and managed to render a full 100% render in 01:02.23, CPU was 02:33.26
PC specs:
32GB Ram DDR4
Ryzen 7 1700 8 core 16 thread
GPU 1070 AMP extreme from Zotac