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Fix DH demand calculation #840

Job	Run time
check	42s
docs	56s
py38 (ubuntu)	3m 55s
py39 (ubuntu)	3m 51s
py39 (windows)	5m 9s
py310 (ubuntu)	4m 5s
py310 (windows)	5m 17s
py311 (ubuntu)	3m 43s
py311 (macos)	3m 50s
py311 (windows)	5m 40s
Deploy docs to GitHub Pages	1m 11s
Upload coverage to Coveralls	3m 48s
	42m 7s

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