Here are two BSD presets I used.
First is one I use often for studio based renders, it is high supersampling so it took 45 mins:
Preset interior3 Adapt BSD 45m32s.png
The other is one I use interiors which have thick glass or lots of lights, I guess not ideal for this, it took 36 mins:
Preset inside medium 36m07.png
Then I tried TR1, which is may most used render option, I ran it first for 30 mins and then 1 hour, IMO 30 mins was enough.
hacienda TR1 1hr.png
I used a crf for the last render
This is very interesting. So, the TR1 engine, in this particular case, took less to time to clear than the BSD versions. I take it however, that you are NOT finding this to be the norm (that the BSD takes longer than the unbiased with Thea)? Why, do you think, that is the case with this image? It's shear simplicity and lack of complex materials maybe?