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A comment on SpaceX test flight of Starship SN-5 [video]. Parent comment
"Opposition class missions" stay on the surface for 30 to 90 days. "Conjunction class missions" stay for 500 days or more.
That confirms the 30 days that you mentioned as a reasonable minimum.
[1] https://www.nasa.gov/pdf/373665main_NASA-SP-2009-566.pdf
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"Opposition class missions" stay on the surface for 30 to 90 days. "Conjunction class missions" stay for 500 days or more.
That confirms the 30 days that you mentioned as a reasonable minimum.
[1] https://www.nasa.gov/pdf/373665main_NASA-SP-2009-566.pdf