Unfortuantely not everyone can afford to throw 2k+ graphics card, never mind the rest of the system to not create a bottleneck.
I'm working with an RTX 2070 (not SUPER).
The scenes in HS would render in QHD in about 45-90 minutes and I reduce them to FHD after that.
There is no complex lighting, no reflections, water ... everything what gives a high load to your GPU and will add a lot of render time.
With an 2070 SUPER (for about 500$, I guess) the rendering time would go down 20-50%.
2080 or higher is no option, too expensive for the speed advantage.
The new RTX 3080 for about 600$ seems like a very good deal, I would guess 50-70% less to my 2070.
So where is the 2k+ need?
Anyways, 3 hours is much too much. Even with my old I5 and an 1050TI these scene would render in 2 hours in FHD.