I was at Si Racha immigration yesterday. It's my local office and I had to get a re entry stamp. I have a non immigrant O based on marriage to a Thai.
I opted for the multiple re entry stamp. Arrived late around 14.10 and was out of immigration by 14.20 with the stamp.
Very good service at Si Racha. Very quiet and efficient. I have used this immigration office due to my location for many years. Can't fault it .