Obviously, they have the legs for it.
I also made the mistake of booking the Cambodia leg immediately following the Thailand flight.
So I was to continue on. A couple hours delay in BKK at the airport then on to Phnom Penh. I’m not out of shape (not badly anyway) but hadn’t even considered I should put a day or so in between the two flights.
I’m sure they’re fine. Just commenting is all.
Still considering another visit, to tell the truth.