How can I process a tourist visa for Thailand from the Philippines and extend my stay to 6 months?

There is no limit and there is no 180 day rule. But you can't live in Thailand without a long term visa. Each entry is at the discretion of the immigration officer you are standing in front of, and eventually they will tell you that you're not a tourist and that you are abusing the system. They'll either give you a warning or deny you entry.

@Nenz ********

for a 6-months stay, the best visa you can apply for, is the 6-months multi entry Tourist Visa. Each entry within the visa-validity period, gets you a 60-days stay permit, which can be extended by 30 days. There is NOTHING SUCH as a 60-days "visa-on-arrival". What Dorai Ching Ching meant is the visa exempt entry. You get stamped in for 60 days and can extend by further 30 days. You can theoretically do a border bounce and on return get stamped in for another 60 days. But this is solely upon the discretion of the Immigration officer at the border. If you got a Tourist Visa, this will ensure that you won't be denied entry

@Nenz ********

pm po

@Nenz ********

if you want to purchase an actual tourist visa from a Thai embassy, then you need to see what that embassy requires directly from them.

If you are eligible for Visa exempt you don't need anything but your passport when you arrive.