At the lunar south pole, nighttime can last for 14 Earth days.
Notes on verification
National Geographic states this verbatim, and it's corroborated by USRA/LPI and NASA technical sources as a standard approximate figure for lunar (and south pole) night duration, though actual duration varies by exact location due to topography and near-zero axial tilt.
Sources
- Inside NASA's audacious plan to build a nuclear-powered ... (nationalgeographic.com)
- https://www.lpi.usra.edu/lunar/lunar-south-pole-atlas/ (lpi.usra.edu)
- https://arxiv.org/pdf/2503.02105 (arxiv.org)
- https://tfaws.nasa.gov/wp-content/uploads/TFAWS23-PT-52-Paper.pdf (tfaws.nasa.gov)