about one week and the second one was about 2 weeks - some years ago. A close friend stayed there for 6 month and another one is running some great projects. ... Havenīt been there for too long ...
There is a great book about, which can recommend to you: Cambodia & Angkor A travel sketchbook; published by Archipelago Press, Singapore; edmbooks.com
It is about the people, the country, a project called "Krousar Thmey" ... It shows lots of superb sketches, very nice photos and well written and informative text. On top it offers lots of "behind the scenes".
I guess, you will enjoy it a lot