Making TDT models support all-positive durations (previously duration… #109

Job	Run time
build-test-publish-wheel / build-container / main	1m 13s
build-test-publish-wheel / build-wheel	26s
build-test-publish-wheel / test-wheel	6m 32s
build-test-publish-wheel / publish-wheel	11s
build-test-publish-wheel / notify	0s
	8m 22s

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