Conversation so far:
Where did Carleton reside post-war?
He arrived in Quebec on 23 October 1786.
What did he do in Quebec?
he was appointed "Governor-in-chief", with simultaneous appointments as governor of Quebec, New Brunswick, Nova Scotia, and St.
John's Island .
Did he do anything notable while Governor-in-chief?
His position as Governor-in-chief was mostly ignored.
What did he do after that position?
He was raised to the Peerage in August 1786 as Lord Dorchester, Baron of Dorchester in the County of Oxford.

Question: How long was he there?
Self-contained rewrite: How long was Guy Carleton in the County of Oxford?