Can you recommend a tour of Pere Lachaise that lasts no longer than 2 hours and focuses on artists and writers?
I don't know about tours, but when we went, some years ago, we were given a very detailed map at the entrance, so we could see where the graves we were interested in were.
You can find a map of the cemetery with the list and location of famous graves here: (in English)
https://www.api-site.paris.fr/paris/public/2018%2F9%2FCPLMapEN.pdf
All information about the cemetery, including an interactive map, is available on the official website (graves, tours, monuments, access, etc.)
https://pere-lachaise.plan-interactif.com/en/#!/category/0
While you're there, don't forget to take a stroll through "La Campagne à Paris," located nearby, one of the few unexpected places in the 20th arrondissement.
I’m researching similar guided tours and came across this guide who works with With Locals. Cannot recommend her personally but I plan to contact her. And I’ll add we did a DIY tour using a map when we visited Paris three years ago. It was fine but we would prefer a guided tour - especially our teen who loves cemeteries. https://www.withlocals.com/experience/walking-with-vips-pere-lachaise-cemetery-95c903d5/?utm_source=google_ads&utm_medium=cpc&utm_campaign=Paris_Pmax&gad_source=1&gclid=Cj0KCQjw2ZfABhDBARIsAHFTxGxhmH5pRU4srLYpA7VwoY2MNYJ6NaKz0Be3iGZrEOr4vsm5ItYY0CEaAl-DEALw_wcB