A bit longer!

- and I had to bring witnesses too. Incidentally, I believe you can do at any Amphoe, as long as you have original documentation. e.g.I was married in Nongbualamphu, but divorced down in Phuket.
Took me just over 30 mins; no witnesses, staff from the office obliged (without asking), had my Affirmation for freedom to marry and Divorce papers, all they seemed interested in was the Affirmation, Statement of Divorce Confirmation from GF Amphur Office (she was married before) Passport and GF ID card.
No ceremony, just sign here, sign there, and a fair bit of photo copying which I undertook, saw office supervisor then Registrar who signs the certificate.
Wife wanted my surname so that ment a trip back to her Amphur for change of ID and Name change on House Book.