I walked by the Re-entry counter at DM airport just after passort control, and asked the officers if it was open 24/7.
They confirmed it was opened everyday albeit there was sometimes no staff available between 1:30am to 3am.
FYI
Cheers,
Thomas.
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TLDR : Answer Summary
The Re-entry Permit Counter at Don Mueang Airport is generally open every day, including 24/7 availability. However, there may be times when no staff are present, particularly between 1:30 AM and 3 AM. It's important to note that while both Don Mueang and Suvarnabhumi airports have 24/7 counters, staffing may vary depending on the presence of outgoing international flights.