@Ariana *********
Terminology is important.
***It is EITHER: if you applied for a 60-days single entry Tourist Visa in your home country and enter Thailand on this visa, You will get stamped in for a 60-days stay permit.
*** OR: you enter visa-exempt (without a visa) and will get stamped in for a 60-days stay permit (if you are a citizen of the 93 countries elegible for a visa-exempt entry)
*** in both cases, you do NOT get stamped any visa upon entry. You only receive a STAY PERMIT stamp!
*** in both cases, you can extend the 60 days with another 30-days stay permit extension on Immigration for 1900.- THB
*** you will have to exit Thailand before the 90 days are up!
*** you can EITHER apply for another 60-days single entry tourist visa by the E-Visa Online system of the Thai embassy in a neighbour country
OR
You spend a few days outside Thailand and re-enter visa-exempt.
*** Now thatβs when the next steps become questionable:
It is upon the sole discretion of an Immigration officer at the border, if he grants you another touristic entry after you have just maxxed out your previous stay with 90 days
He/She can deny entry, or grant you another 60 days stamp but will warn you, that this was your last touristic entry for the next few months, and that you should use a proper visa for the true purpose of your stays. And he will tell you that you should not use touristic entries for a longstay in Thailand. And he can ask you for the FAMOUS three proofs: 20,000 THB in CASH or equivalent in CASH (!!) in another currency, an onward travel out of Thailand within 60 days, and a booked accomodation for the next few nights
While there is no rule and no law that says how often your can enter and how long you can stay inside Thailand on visa-exempt stamps, the crucial thing is that an Immigration officer might come to the conclusion that you have overused free touristic entries