What are some good Thai language schools in Bangkok that offer long-term ED visas and how many hours per week are required?

Hi everyone,

Could you please recommend me a good thaï language school in BKK that provides long term ED visa ? (6 months to 1 year)

I'm looking for a school I can trust to manage administrative stuff & located near a BTS Station & if possible not so expensive & nice way of teaching (but first criteria is the most important, I don't want any trouble with thaï authorities)

And do you know how many hours a week (at minimum) do I have to attend ? Can I go for exemple only twice a week but spending more time a day ? (I will really learn thaï but I would appreciate some free time to visit the country ...)

Thank you very much for your help