I am coming to Thailand with a non-O visa, valid for 90 days, applied from Belgium. I must complete the TDAC form no later than three days before arriving in Thailand. Upon arrival in Thailand, I must report to immigration within 24 hours with a TM30 document. With my passport and proof of residence, I can open a bank account with the aim of applying for a one-year extension. My question: If, during my 90-day stay in Thailand, I travel to Cambodia with my girlfriend for a week and then return to Thailand, do I need to complete a new TDAC form before arriving in Cambodia and also before returning to Thailand? Do I need to have a new TM30 document completed upon returning to Thailand? Will my non-O visa remain valid? Do I need to report to immigration again? Thank you in advance for the information.