Changing flighta at Bangkok - Don Mueang

[esa-aardvark]

Hello, anyone know about the above. I have been to Bangkok
many times, but never changed flights at DMK. I arrive at 9.30 am., and there are plenty of onward flights ie one every hour
or so from 10.45 onwards. Should I allow 2, 3, 4 hours ?
Advice much appreciated, John

edit.. just looked at Google flight search for another flight and it informed me
that I fly to Paris 12th April. That flight was booked direct
with the Airline, email&phone. How on Earth do they know that ?
Things are getting scary !