Hi, I have a single entry Non-O visa and have been stamped in until the 29th of November. I'm going to leave Thailand soon for 3 weeks and will return at the beginning of November. I will get a single re-entry permit at the airport upon departure. When I return I believe I will be stamped in until the 29th of November. Can I apply for an extension of stay at Immigration (BKK Div 1) say 2 weeks before the 29 Nov stamp expires?