Going abroad to LPB in Laos was a great experience and I really enjoyed being able to get to know the people and the culture of southeast Asia.
I would recommend going for at at least a month to get the full experience, and in order to give the people you are interacting with a better chance at getting to know you. Also, I would plan to allot more money than you think you need initially since you will want to travel while there. Also, it is nice to be in Laos not during the heavy tourist season.
Overall it was a fantastic experience and I recommend it to anyone who is interested in learning about the way of life over there. However it is a bit of a culture shock so going into it I would say that you should keep an open mind and be patient. Definitely a worth while experience. Also the program that I did had to do with teaching English and the teaching is very legitimate and important, so if you don't think you would like actually teaching a class I would pick a different program.