The thai embassy in London is pretty quick to turnaround a non O, typically they say 2 working weeks , I got mine recently within that time and I applied for mine 2 months before I was due to travel
When is your arrival date you put on the visa application? I had mine approved within the 2 working weeks they suggest (London). They said it could have been earlier but because I had applied 2 months before my trip that they were dealing with more urgent requests first. So it could take upto 2 weeks.
sorry but most of what you have said is totally untrue, so if your source is Internet AI then I would suggest you use something more reliable and correct.
So if you leave UK on a Tuesday and enter thailand on Wednesday. You fill in from uk Tuesday date arrive thailand Wednesday date. Leave the departure date from thailand blank as it is not required
crikey if filling in a TDAC is stressful then I wouldn't come to thailand. Just go with the flow and dont worry, when you do fill it out just fill in the details that are mandatory those with an *. Ignore the rest