If you've been here 4 months, six months, or longer on nothing but visa-exempt entries, just going out then straight back in, however, then the likelihood of an immigration officer viewing your history as "extensive" goes up several notches.
Technically they can insist on 20K B in cash. They may do exactly that.
However, last year I was pulled aside at the airport and asked for the Three Proofs, and a copy of my Thai bank book was accepted. (I had already had to show it in KL to get the visa in the first place).
After this entry, you'll have been here over 6 months on tourist visas and out-then-back-in visa-exempt entries.
That's the point where you have a fair likelihood (not to say this definitely *will* happen, its all down to the immigration officer working with you) of being questioned about what you're doing here, and potentially either denied or told "last time".
All you can really do is have the three proofs of finances (ideally 20K Baht in cash, though officers have been known to accept bank statements), of onward flight ticket, and of accommodation.
That and a story prepared on what you've been doing here these past six months.
Officially, no limit on *air* entries (land entries are officially limited to 2 per calendar year), but if you've been here since January on out-then-straight-back-in visa-exemptions, you're at the point where you have a fair to high likelihood of being pulled aside and questioned on what you're doing here.
All you can really do is have the three proofs with you on the way back in; proof of accommodation, 20K Baht in cash, and onward travel ticket.
Sounds like he's doing border hops and extensions.
Telling the truth (more or less), but still a red flag as far as the meow meow is concerned. If hes relying on serial visa-exemptions, its only a matter of time before he gets pulled aside at the airport and told "Last Time", or even denied entry.
Thus leaving the kitten alone again with no carer.
Yep. Your boss just seems determined to show even more definitively why she'd be an awful, toxic person to work for, by outright lying to you like that and trying to menace you. She knows damn well that the initial visa cannot be cancelled, only the extension. If she says otherwise (that she honestly thought otherwise) I'll call her a liar to her face. Shes experienced in the field of employing foreigners, theres no way she doesnt know.
The only response she deserves is to be told to shut the fuck up & go play on a busy road.
As Shaughn said, whilst there is no *official* 6-month rule, as in, no stated, publicly-viewable one, each immigration department at each entry point will have its own internal rules and guidance issued to trainees.
It sounds like DMK *may* have an internal rule or more like an internal *guidance* (not a Thai law) that over 6 months here on tourist stays should attract more scrutiny.
There is indeed no six-month rule. Some people get questioned after just two entries, others sail through again and again for over a year with no problems.
However, if you've already been here six months on short-term stays, you're in the general area where there is an increased likelihood of being summoned to the office in the back and questioned as to what you're doing here.
As John Stanners said, you can still get questioned or denied entry at the airport or land border even with a tourist visa (the former happened to me before). While there is indeed no limit on air-entry visa-exemptions, if you've got a history of just going out and back, repeatedly, then the likelihood of being questioned or denied entry goes up. It's all up to the imm officer.
All you can really do is have the three proofs mentioned with you. If you're applying in KL, you need to submit the three proofs at the embassy to get the visa in the first place anyway.