Depends which visa you are planning to apply. Tourist visa TV gives you 60 + 30 days. For the special touris visa STV they have different requirements. Check your embassy website.
Visa is what you apply from the embassy when you enter the country. If you are already in the country its called extension of stay which you apply from the immigration. Big difference.
Of course I do not know everything, nobody does 😀 People ask these questions about daily and it took about 30 sec to google the Thai embassy website. I hope you found the information you are looking for, no need to thank me 😂