Hi,
I did like asked and here are my two renders, without and with portals @ 20samples / no other light sources.
Without ^
With ^
It took ~1s more for the one with portals but it is worth the wait
Despite all that, I don’t think my particular setup will have any uses for portals, because I am aiming at rendering a scene where the light sources will be inside the Inn, like a late evening.
Cheers !