u can edit something without rendering completly. Wenn i made fur in Blender i said there should be like 1000000 Hairs on the final render but just show me 10% of all Hairs. Same goes with particles or polygons. also u can edit the light bounces. When u edit it u led the light only bounce a few times and when u want the final edit u let it bounce more often. hope i could help and have a nice day
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