If you stay inside Thailand the count of days being in Thailand continues.

If you leave Thailand to obtain a new visa the count stops on departure and starts new on entry.

The OP did not mention where and at the moment we have Korat and Surin, antother 73 offices to go, but that will be a very long list.

Sorry, I close it down, if you want to know, give details otherwise it will be check with your local office. Good luck.

You are not alowed to walk around in Thailand without a valid stay stamped in a valid passport.

Talk to your Embassy to find a solution to avoid this, some countries offer an Emergency Passport.

@Kari *******

Medical Extensions can only be applied BEFORE people get on overstay, If already on overstay they are to late and no extensions will be given.

@Kari *******

It is to late, he is already on overstay. Hospital can not lower the fine at Immigration.

@Nick ******

Just read. It depends on how he met authorities

What is a 15 day tourist visa?

There is a tourist visa that gives people 60 days of stay and can be extended once with 30 days

AND

There is a 15 day visa on arrival, which can not be extended, if you apply you get application not approved and 7 days to leave the country.

You friend arrived without any visa and used the 30 day Visa Exempt Scheme.

If he did not contact Immigration during his stay, he will be in overstay and face a 500 thb a day fine with maximum 20.000 Thb. Depending on reporting himself at airport Immigration or beeing caught there are other issues to solve.

Fisrt off all, your University is only providing documents to apply for a visa or extension of stay at the Immigration Office.

You get OR a Non Immigrant ED visa which gives you 90 days of stay OR an

Extension of Stay depending on course length with maximum 1 year, what ever comes first.

If you like to leave during this issued stay, you buy a re-entry permit at the Immigration Office or last moment on some International airports. This re-entry permit is valid until and will give you the same date as mentioned in your passport as permitted until xx/xx/xx

I posted the rule and others posted the rules of renting property.

It is clear, how to avoid these rules or how to use other ways to show Immigration that you stay where you do not stay is not a good way forward.

Remember that people do get fined and those who advice to use alternative ways only laugh and type again and again.

Good luck.