That is a loaded question. If you have a benchmark you could upload we could render it at some resolution.
Not looking at render times, just set up with lighting and color and camera, should have clarified I will edit my post to add this part. I will also add a file to test
I guess I'll have to wait until next year (future version) :-)
Happy new year!
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It is a bit like asking how long is a piece of spring
It is an "artistic" process and the time taken depends on when you are happy with the result. That process shortens with experience (the more you render the more you know what you can achieve and how you can achieve it!
To reduce the setup time I always add Appearances as I model each part, so when I have an assembly it is only about setting up camera, environment, lights.
Dropping in Environments is straight forward. The real time is Camera Angle, Environment angle (reflection) and lights! It also depends on if you are setting "Bump" on textures etc
On average that would be around 15min but I have spent hours fussing over lights and reflections! I'll have a go at your assembly a little later.
This is what I do so This only took 10mins to set and preview
12mins that includes finding the background image. Environment - Daytime.hdr to give a faint shadow (technically not quite correct as the car shadows are more the other way
Took a little time to get the angles aligned (Camera 24degrees) vertical with the building, aligned with the kerb) That using the existing colours. Personally I would have changed some of the colours for different appearances to add some more reflections to match the glass building (but that's just me)