ive got mine and it took 3 weeks, I had to submit more docs. and that is through the official Thai embassy for my Non O Visa which I have. my LTRV is in process and hopefully I will collect in Bangkok when I get there.
You MUST apply for your non O Visa whilst in the UK. You cannot do it from Thailand. It should take around
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weeks if you get all your paperwork in place. Look online to apply and get all your ducks in a row before starting. There is a checklist to follow, read it thoroughly twice and then apply! Good luck.