took me 1 hour in bank and definitely 20k. There may be different levels of debit card but both the branch and call centre have confirmed mine is capped at 20k. I Got 50k over the counter by showing passport. If I try 30k at ATM it tells me 20k per day only
yes, also experienced that but at least you can check in via ticket machine and then go to bag drop with domestic. With international you have check in at the counter even if hand luggage only. I'm not sure if the Thai Nationals are treated the same though.