Just a heads u,I was just at Jomtien immigration and a young guy in front of me was asking for a 30 day extension and the guy told him his visa didn't finish until March 8 and to come back on the 5th not sure if it was the way he looked and dressed but clearly the guy who's always at the front desk wasn't happy with him and when the guy asked why he was told to leave so I'm not sure if this is a new rule for 30 day extension in Jomtien or it was just the circumstance
TLDR : Answer Summary
Visitors at Jomtien immigration have observed that when requesting a 30-day extension, they are instructed to return only during the last five days of their current stay. This seems to be a standard operating procedure due to high traffic at the office, regardless of whether it is busy or quiet, to manage the volume of requests efficiently.