Could also be some people just get bored with their profession and want a change (burnout).

I apologize for deviating a little bit but I thought even this question is appropriate under this post. There is a small situation that confuses me:

1. I was issued an I20 (Document of Duration of Stay) for my Masters degree for 9 months. Most of my seniors told me that I cannot complete it in 9 months and that I should be extending it further. I need to have 12 credits to complete my Masters. So taking 3 credits a quarter (my university has a quarter system), it would take 3*4 quarters to complete all the 12 credits requirement. So logically speaking I will be completing my course in 12 months but as this includes a summer, I should be doing an internship, so it'll take 15 months to complete my course. All is well. Is that right or did I miscalculate it somewhere?

2. I saw two options: Masters with thesis and Masters without thesis. I know "Which one is better?" is a silly question but I'd really like to know the difference between them and how it would affect my future...

3. If suppose, I take up Masters with thesis, would I still be completing my course in 15 months or will it be extended further down the lane? And I heard from a friend that I should be "sponsored" by my professor to complete my thesis. Is that right?

I'm really sorry about the questions but I'm in a small confusion. Hope someone clarifies.

>>I'd really like to know the difference between them and how it would affect my future
Furure employers could care less which you choose, so pick the one YOU like best and the one that will give you the best grade(s). As for your other questions you have to talk to your school consolers.