Visa and Multiple entry travel

I can't speak to the "Marriage" VISA...but you will need an additional Multi-entry stamp (TM-08) if you plan to leave the country while on a 1 year "Retirement" visa. If I'm not mistaken (please correct me if I'm wrong) there are two options, a one entry, or a Multi entry stamp option. If you don't have the additional stamp, your 1 year visa is then reset back to zero.

@WiredTight

Your information is correct. At least it has been correct for me over the past several years.

If one leaves without a re-entry stamp (single or multiple), your 1-year visa stops.

Both retirement and marriage extensions can be with single or multi entry

Normal extension is 1900 thb the multi entry extension is an additional 1900 thb per year

Great , Thanks for the good information   

    Both retirement and marriage extensions can be with single or multi entry
Normal extension is 1900 thb the multi entry extension is an additional 1900 thb per year
   

    -@martinoo2002

Actually the multi entry extension on itself is 3800 thb so totals to 5.700 at a new extension

Your singe entry you can 'renew' for the occasional trip at your immigration office or directly behind immigration exit at the airport at 1.900 thb per time

This will not extend the date for the original visa extension

But if you forget the renewal before your flight you have to apply etc all over again upon return including the trip to a neighboring embassy