18:30, Summer, sunny. Grassy field surrounded by forest on far horizon. Warm, evening light and perfect surroundings for archviz.
Sun is unclipped, so in Cycles, you don't need any light source, other than this HDRI for realistic shadows.
Methodology:
7 expositions of the environment with 2 EV spacing (140 photos) + 7 expositions with 2 EV spacing of only the sun with ND4000 (12 stops) filter+ 7 expositions with ND1000 stacked with ND4000 filter (10+12=22 stops).