BKK airport is the same, going through this airport trying to get out and back in the same day can be difficult. You said "border run" earlier, so I gave you an answer which doesn't apply here since you are not doing a border run. Please, next time, provide accurate information because it can gets very confusing while trying to help. A border run usually refer to getting out of the country by land, just to do a U-Turn and coming back into Thailand immediately (generally 30min-1h later), depending on how long the process is on the other side.
Flying out and coming back is not a border run. A border run is going out by land and coming back 30 min later after getting into Cambodia and coming back.
You get a bus to the border, not to Siem Reap. Just look at YT video about border run, you don't seem to have done any research. You get out of Thailand and come back in immediately after entering Cambodia.
She probably meant visa exempt (Vietnam). You do not need to pay expensive price for border run with agent service. Just do a normal border run. Are you vaccinated?
I got married 2 months ago in Chaiyaphum and it took 1 hour, no police check, nothing. Only thing needed was the translated/certified affidavit (paper saying that I can get married). The mayor will ask a few questions and that's it, you get your marriage certificate.
It will extend until the country fully re-open, which include 30 min out-in border run. I've said this since day 1, as long as people can't border run, Covid extension will remains.
Yep, as I predicted, as long as it's not possible to border bounce easily (go to Savannakhet, for example and come back 30 min later), they will keep extending Covid extension.