Extending Thai visa immediately after entering possible?

I tried googling this for hours without success.

If I enter Thailand on single entry 60-day visa, can I extend it for +30 days (for a total of 90 days) IMMEDIATELY the next day after the entry?

E.g. entering on Aug 1 and extending it on Aug 2. Have anyone done this?

Yes. :slight_smile:

Theoretically yes, but the extra 30 days is at the discretion of the official doing your extension, hence in many places it is recommended that you wait as close as possible to the 60 day expiration date before you apply for the extension, as they may give you the extension from that date itself (the date youโ€™re at the immigration office) as opposed to from the date of the original expiration date.

Yes, several times.