Just had my passport renewed - 20 calendar days in total. Said I would come back to update once done, so here I am! Ended up sending slightly later than my earlier post indicated I had, accurate timeline below.
Timeline:
6 June: Mailed to embassy via Special Delivery
7 June: Confirmed delivered to embassy via Special Delivery tracking
10 June: Embassy email to confirm receipt of renewal
13 June: US DoS email to say passport received (presumably in the the US)
18 June: US DoS email to say passport has been printed and mailed (presumably from US to embassy)
25 June: Special Delivery return envelope tracking picks up
27 June: Passport (and all supporting documents) received back in single Special Delivery envelope
Just a few notes on process:
Follow the instructions on the embassy website only.
Print application and online payment confirmation and mail it to embassy with supporting documents via Special Delivery. Everything will come back in the return special delivery envelope (not separate as with domestic applications).
Payment - select regular service as there is no expedited via mail. Only expedited is in person at embassy for emergency.
My only frustration was the huge gap of 8 days between my passport mailed notification and receiving it in hand. Research tells me this was because the embassy sends the passports to the US for processing, so when I got that notification it was being sent back to the embassy, and only once the embassy received it did the Special Delivery go out.
Hope this helps!