Hi everyone!
Here is my timeline for Luzern city for facilitated naturalization. It took ~15 months (from the time the application was submitted until I applied for the Red booklet 
) to be naturalized. Below is my detailed timeline.
| Date | Event / Status Change | Wait Since Last Update |
|---|---|---|
| Late Dec 23 | Received letter from Stadt Luzern (Gemiende) that I am eligible to apply |
N/A |
| Mid Feb 24 | Collected application form and document checklist from Gemeinde |
N/A |
| All Mar 24 | Gathered all supporting documents |
N/A |
| Early Apr 24 | Application submitted to SEM (via post) |
- |
| Mid Apr 24 | Received confirmation of submission from SEM |
~2 weeks |
| Late Apr 24 | Received bill of 900 Fr. from SEM |
~1 week |
| Late Oct 24 | Call from Police officer to schedule interview at Police station |
~5 months |
| Early Nov 24 | Received letter from Gemeinde confirming interview date and time in early Dec |
~2 weeks |
| Mid Nov 24 | Contacted Police officer to reschedule interview in early Jan (was on holiday during Dec) |
~1 week |
| All Dec 24 | Studied for interview using materials provided by Gemeinde |
- |
| Early Jan 25 | Completed interview with 12/12 written questions correct |
~2 months |
| Mid Apr 25 | SEM contacted two references who were Swiss (by birth) |
~3.5 months |
| Early May 25 | Both references sent recommendations to SEM |
~3 weeks |
| Mid May 25 | Received two forms from SEM to sign (stable marriage and respecting laws) |
~1 week |
| Late May 25 | Received conditional approval letter from SEM (wait of 30 days appeal period) |
~1 week |
| Late Jun 25 | Received legally binding letter (final confirmation) from SEM and Fide language certificate was returned |
~1 month |
| Early Jul 2025 | Contacted Heimatort (Gemeinde) for Heimatschein and Bürgerrechtsnachweis |
~10 days |
| Mid Jul 2025 | Received documents from Heimatort (Gemeinde) and got confirmation my data was entered into the Personenstandsregister \ Zivilastandsregister (Swiss civil register; Infostar) |
~2 weeks |
| Late Jul 2025 | Booked an appointment (www.schweizerpass.ch) with Passburo in Luzern for the next day |
~2 days |
Just applied today for the Pass and ID Kombo, 158 Fr. 
At the Passburo today, the lady asked for my C-permit to verify my details in the system. The lady was super nice, she didn’t take my C permit and returned in back to me after the process was completed. She told me once I receive the Pass and ID, I can go to the authority that issued the C-permit and return it back to them. So I am guessing I can do that probably at Amt für Migration or Einwohnerkontrolle (Gemiende).
This forum has indeed been an inspiration and motivation for me especially in times where there were long waiting intervals for communications from SEM.
I wish you all patience and best of luck in all your endeavors! 