This answer reminds us that an Earth-Moon L1 or L2 vanilla1 halo orbit remaining always visible to some patch on the Moon's surface requires station-keeping.
Queqiao uses such an orbit having continuous visibility with both Chang'e 4 on the Moon's far side and with Earth.
Question: Roughly how much station-keeping delta-v per year would be required for such an Earth-Moon halo orbit? This must have been worked out long ago, perhaps in "DoKaRoMo?"
note: For comparison, JWST will be in a vanilla halo orbit about the Sun-Earth L2 position and require only about 2.4 m/s per year for station-keeping! This is due to some clever balancing of solar radiation pressure and bi-weekly calculations and station-keeping maneuvers.
- What is the required burn to keep a satellite at a Lagrangian point?
- Could JWST stay at L2 "forever"?
- What happens to JWST after it runs out of propellant?
It's likely that an Earth-Moon halo orbit will require much more due to the Moon's eccentric and inclined orbit with respect to both Earth's equator and its orbital plane.
See also Farquhar, R. W.: "The Control and Use of Libration-Point Satellites", Ph.D. Dissertation, Dept. of Aeronautics and Astronautics, Stanford University, Stanford, California, 1968