personality development

The life is lived by every one on the behalf of their own way........and they came to know about the personality very well when they become mature......they know how to impress others,the way of talking,their daily activities, and i think,  all  activities done by them is already known to them  ....that what are they going to do......
but suppose that they don't know about all, they didn't develop their personality.....
CAN IT POSSIBLE TO DEVELOP THEIR PERSONALITY BY A SINGLE 2 hr. PDP (personality development program) IN  YEAR ?
even then in those 2hr. near about 1hr and 15 min. moved  in just laughing and watching some add.
and in rest of 45 min it is told to us ....how should be our behaviour towards other , there should be feelings of respect in your heart for others etc.......some interesting things also told to us.

i am writing all these because from my point of view it is not easy to develop personality by attending a 2hr. PDP , the personality can not be developed in such a way  (arre kisi rote huwe bachhe ko doodh thde hi pilana hai...) i think it develop with our own efforts, by following some one, and also as in PDP it is told to us about some good manners those good manners can not be gained with in  120min. these all , we teach from our parents since we born and from our elders and also from our teachers as we entered in school .
and i think u can understand what i want to say so now i stop to write.........
but i want to know .........what do you think about the fact  ??
.....the comment box is waiting for your comment....    :-)