Conversation so far:
Who were Jean-Philippe Rameau's librettists?
Musicologists can only guess at the dates of Jean-Philippe Rameau's six surviving cantatas, and the names of the librettists are unknown.
What did the librettists do with Jean-Philippe Rameau?

Question: How long was Louis with him?
Self-contained rewrite: How long was Louis de Cahusac with Jean-Philippe Rameau?