The problem with a statement like that is it depends what your latitude is. 23mins after sunset here might as well be noon.Specifically not the BS "xx% light transmission" numbers companies throw out, but functional in terms of what I can expect it to do in low, dim shadows and twilight. As in, "Allows for complete visibility of both reticle and antler tines at 200 yards in the open 23 minutes after sunset", along with usability comparisons, like "Matches NF/Maven/Leupold by the minute after sunset."
In Southern Florida, it gets dark real quick. Norther MN, sunset to civil twilight end is a lot longer.