, You need to contact your branch or CW branch of Bangkok Bank to confirm that. Yes, there are people who get letters at the CW branch. I don't know whether they have any conditions to do that, such as which branch your original account is, whether in the same business zone, etc, etc, or they issue without any condition.
, but you travelled OUT from Thailand. Next one will be your first 90 days report AFTER international travel which you entered Thailand from abroad again. You need to do this in person, too. (Changed recently)
The report in March was the first 90 days report after you granted your extension.
It would work as long as your bank branch takes too long to make letters/transaction history.
What is an advantage to applying for an extension 45 days prior depends on individual priorities and/or preferences. So it's something you have to decide on your own.
We just advise people not to wait until the last minute to go to the office to apply for an extension in case they ask for additional documents (and it'd easily happen).
, an extension is added (top up) to your current stay as long as it’s for the same reason as the current stay stamp. You wouldn’t lose any days by applying for the next extension earlier. All following yearly extensions have same expire date of each year if you stay on the same reason.
IF you apply for an extension for a different reason from your current extension, it’s start on the day of application in most cases.
, only one 30-day tourism extension is allowed per one entry on visa-exempt or tourist visa. If you enter on visa-exemtp, 60 days total is the length you can stay.