One that I didn't mention originally, is
audioleq
whose free version can do
Graph Peak Levels, Unweighted / A-Weighted L+R Leq
in a couple of seconds as well as batch processing.
there is also a version that does
Peak, RMS Unweighted / A-Weighted Histogram
and 2-Channel LKFS Loudness (RLB/R2LB), 44.1 to 384 kHz…
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