add comment attempting to explain myself #718

Job	Run time
lint/style-and-typos	1m 16s
linux/3.8/bare-env	10s
linux/3.12	20m 40s
osx/3.10	21m 57s
win/3.9	50m 21s
linux/3.11/conda	23m 56s
linux/3.10/mpi	10m 20s
linux/3.10/cython	22m 30s
win/3.8/pip	29m 47s
process-coverage-${{ matrix.TARGET }}	0s
	3h 0m 57s

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