Retirement extension due end of next month, does anyone know if Jomtien allow applications 30 or 45 days in advance ?

Thirty days is their normal requirement but with a good reason they will do it earlier.

45 days, but it seems to sometimes depend on how busy they are.

A friend with 32 days remaining and no proof of upcoming travel was recently turned away at Jomtien. It was a very busy day there.