What type of culinary school and duration is required for the DTV in Thailand?

Don’t believe you can take a cooking course for a couple months and believe there going to let you enter an exit Thailand for 5 years

Depends what you're cooking. For Pad Thai you'll need short course. For masaman curry longer course.

they really should put together a NATIONAL decision on what all the soft power requirements are rather than so many people upending their lives predicated upon ambiguous announcements. for example, research indicates there are no thai music festivals. why include that? but there are countless scuba schools and scuba and snorkeling boats. all those would benefit greatly by being included in DTV. there are rock climbing courses available in Krabi ( Railay beach) but not included. art schools could spring up, celebrating and showcasing thai / Buddhist art. if they are included. and there really should be and COULD be Thai music festivals, given a little encouragement. just sayin’…

This is up in the air like the rest of the requirements, depends on if the office had a good week end or not.

That depends on the requirements of the Thai embassy you'll be applying at. Each embassy makes their own requirements so check how long of a class the embassy you'll be using requires.