[meteorite-list] Lunar Meteorite Quiz - How big an object with velocity to get a new Lunar Meteorite to Earth?

[drtanuki]

Dear List,
  A big thank you in advance! This should cover most of the experts in the field...
Since there are many on this list with advanced degrees and also novices I pose this question.- How large of diameter, an impact object, with what velocity would it take to get a new Lunar Meteorite to Earth and what is the fastest or average transit time? Thanks to those that are entertained!  Invited are some of the world"s top experts for an answer or re-framing of the question. Indulge. Dirk Ross...Tokyo