I've done some interior rendering tests with scene from corona render blog - https://corona-renderer.com/blog/corona-c4d-a1-1/
I've used DL with Diffuse and one quick test (1k resolution) with DL/AO which is super fast
The scene was only lit with one HDRI map.
The two 2k images rendered almost three hours each on a single GTX 780 with 16000 samples and are still noisy especially on the second image with lights near the bed.
The third DL/AO version rendered for about 1 minute and was estimated to finish in 25 minutes with 16000 samples.
The images were postprocessed in PS with "Camera Raw Filter".
2k DL/Diffuse:
2k DL/Diffuse with bed lights:
1k DL/AO:
