External regions #735

Job	Run time
linux-64-py3.10	5m 35s
Standard 1-Zone Example (MTC)	16m 57s
Standard 2-Zone Example (SANDAG)	8m 6s
estimation_mode_test	16m 6s
macOS	16m 37s
random_seed_generation_test	2m 25s
win-64	12m 26s
prototype_mtc	42m 10s
placeholder_psrc	36m 27s
develop-docbuild	0s
prototype_marin	2m 5s
prototype_mtc_extended	2h 14m 29s
placeholder_sandag	1h 54m 26s
prototype_sandag_xborder	4m 14s
production_semcog	4m 53s
prototype_mwcog	45m 5s
placeholder_multiple_zone	7m 19s
	7h 49m 20s

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