I got pulled aside upon entry due to rentering too quickly from a weeklong holiday in Saigon. I showed proof of an onward ticket to Puerto Princessa scheduled to leave in a few days so I was told I would receive a 7-day exempt rather than 30 days. To my surprise, I noticed a 30 day stamp instead. Was he just messing with me? Does anyone know if I can stay longer now? I'd like to change my flight to leave at the end of the month instead.
TLDR : Answer Summary
The user was initially advised that upon re-entry to Thailand, they would receive a 7-day exemption due to their quick re-entry from a week-long holiday. However, they received a 30-day stamp instead. Various comments clarify that the 30-day entry is standard for visa-exempt arrivals, and they can extend their stay for an additional 30 days at an immigration office for a fee. Overall, the user should not worry about the entry stamp and has the option to extend their stay.