Conversation so far:
Did Edgeworth David do any writing in Edgeworth David's later years?
In 1931 he published the Geological Map of the Commonwealth and the accompanying Explanatory Notes.
Are there any other interesting aspects about this article?
In September 1920, David was created a Knight Commander of the Order of the British Empire for services during the war.
What did he do to receive that honor?
In 1915 the Davids offered their home to the Red Cross convalescent home for the rehabilitation of injured servicemen.
Where did he spend his later years?
Returning to Australia, David purchased Coringah, a cottage in the Sydney suburb of Hornsby.
Did he do anything noteworthy at this time?
He also took up a long-cherished project, the writing of a definitive work, The Geology of the Commonwealth of Australia.
Did he live alone or was he married?
CANNOTANSWER.
Did he do any charity work?
In 1915 the Davids offered their home to the Red Cross convalescent home for the rehabilitation of injured servicemen.

Question: How long did they use his house for rehab?
Self-contained rewrite: How long did the Red Cross use Edgeworth David's house for rehab?