My wife was just approved in Hanoi as a dependant.

26th July: Applied

31st July: Pending Approval

5th August: Approved

Five and a half working days total as I believe the 28th was a holiday. No additional doc requests.

Docs provided:

6-month statements for her UK Revolut account. £12k in there for 3 months. Revolut doesn't seem to provide a proper monthly statement if there are no transactions in a month, so it was just a one-page document covering the whole period. Also a screenshot of the currency conversion to baht on the day.

Thai marriage certificate

Location proof: hotel info page, map, room key. Vietnam entry stamp in passport. Selfies in the hotel lobby with the sign.

Passport photo

My DTV

I had an issue after first submitting where the application was stuck in payment pending, but I hadn't been given a chance to actually make the payment. I think I might have clicked off and back, so I had to resubmit the whole thing. Other than that, a very smooth process comparable to my experience with the Jakarta embassy.