1 year extension of stay at Rayong immigration in my case #5. You can get extension within 20 Minutes, in my case just 15 minutes if you are well prepared and your paperwork is according to the very simple immigration requirements .
1. Go there on Wednesday or Thursday ( my experience in Rayong)
2. Have all required documents ready on hand
3. Proper dress
4. No need for agent
5. Make sure you have latest Bank statements (12 months + Bank letter) available as well as updated (same day as application) ATM update.
6. My recommendations only applies if you meet the $$$ or affidavid requirements.
By the way, it took me just 1 hour to complete TM 7, drive to copyshop and get the documents done since they are always same. One hour per year, not bad, child labour, Kindergarden