Conversation so far:
What was the Cornwall and its connection with William Murdoch?
In September 1779 William Murdoch was sent to Redruth in Cornwall as a senior engine erector, responsible for the erection, maintenance & repair of Boulton & Watt engines.
Did William Murdoch enjoy this job as Senior Engine Erector?

Question: How long was he there?
Self-contained rewrite: How long was William Murdoch in Cornwall?